DxGridDataColumn.GroupInterval Property
Specifies how to group data rows.
Namespace: DevExpress.Blazor
Assembly:
DevExpress.Blazor.v24.2.dll
NuGet Package:
DevExpress.Blazor
Declaration
[DefaultValue(GridColumnGroupInterval.Default)]
[Parameter]
public GridColumnGroupInterval GroupInterval { get; set; }
Property Value
Available values:
| Name |
Description |
|
Default
|
For date/time columns, this option is the same as the Date option. For non date/time columns, this option is the same as the Value option.
|
|
Value
|
Rows are grouped by the column values.
|
|
Date
|
For date/time columns, rows are grouped by the date part of their values. The time part is ignored.
|
|
DateMonth
|
For date/time columns, rows are grouped by the month part of their values.
|
|
DateYear
|
For date/time columns, rows are grouped by the year part of their values.
|
|
DateRange
|
For date/time columns, rows are combined into the following non-overlapping groups according to their date value as compared with today’s date: “Beyond Next Month”, “Next Month”, “Later this Month”, “Three Weeks Away”, “Two Weeks Away”, “Next Week”, “Today”, “Tomorrow”, “Yesterday”, “Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”, “Last Week”, “Two Weeks Ago”, “Three Weeks Ago”, “Earlier this Month”, “Last Month”, “Older”.
|
|
Alphabetical
|
Rows are grouped by the character that the column values start with.
|
|
DisplayText
|
Rows are grouped by the column values’ display text.
|
|
Custom
|
Custom logic is used to group grid data.
|
The GroupInterval property specifies how to group data rows. For example, you can group date-time values by year, month or date, or you can group text values by display text or against individual characters.
@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable
<DxGrid Data="GridDataSource"
ShowGroupPanel="true"
CustomizeCellDisplayText="OnCustomizeCellDisplayText">
<Columns>
<DxGridDataColumn FieldName="OrderDate"
DisplayFormat="d"
GroupIndex="0"
GroupInterval="GridColumnGroupInterval.DateMonth"/>
<DxGridDataColumn FieldName="Customer"
SortMode="GridColumnSortMode.DisplayText"
GroupIndex="1"
GroupInterval="GridColumnGroupInterval.DisplayText" />
<DxGridDataColumn FieldName="Freight"
DisplayFormat="n2" />
</Columns>
</DxGrid>
@code {
object GridDataSource { get; set; }
NorthwindContext Northwind { get; set; }
protected override void OnInitialized() {
Northwind = NorthwindContextFactory.CreateDbContext();
GridDataSource = Northwind.Orders
.Include(i => i.Customer)
.Include(i => i.OrderDetails)
.Include(i => i.ShipViaNavigation)
.ToList();
}
void OnCustomizeCellDisplayText(GridCustomizeCellDisplayTextEventArgs e) {
if (e.FieldName == "Customer")
{
var customer = (Customer)e.Value;
e.DisplayText = $"{customer.CompanyName} ({customer.Country}, {customer.City})";
}
}
public void Dispose() {
Northwind?.Dispose();
}
}
using Microsoft.EntityFrameworkCore;
#nullable disable
namespace Grid.Northwind {
public partial class NorthwindContext : DbContext {
public NorthwindContext(DbContextOptions<NorthwindContext> options)
: base(options) {
}
public virtual DbSet<Category> Categories { get; set; }
public virtual DbSet<Customer> Customers { get; set; }
public virtual DbSet<Invoice> Invoices { get; set; }
public virtual DbSet<Order> Orders { get; set; }
public virtual DbSet<OrderDetail> OrderDetails { get; set; }
public virtual DbSet<Product> Products { get; set; }
public virtual DbSet<Shipper> Shippers { get; set; }
public virtual DbSet<Supplier> Suppliers { get; set; }
public virtual DbSet<Employee> Employees { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) {
if(!optionsBuilder.IsConfigured) {
optionsBuilder.UseSqlServer("Server=.\\sqlexpress;Database=Northwind;Integrated Security=true");
}
}
protected override void OnModelCreating(ModelBuilder modelBuilder) {
modelBuilder.HasAnnotation("Relational:Collation", "SQL_Latin1_General_CP1_CI_AS");
modelBuilder.Entity<Category>(entity => {
entity.HasIndex(e => e.CategoryName, "CategoryName");
entity.Property(e => e.CategoryId).HasColumnName("CategoryID");
entity.Property(e => e.CategoryName)
.IsRequired()
.HasMaxLength(15);
entity.Property(e => e.Description).HasColumnType("ntext");
entity.Property(e => e.Picture).HasColumnType("image");
});
modelBuilder.Entity<Customer>(entity => {
entity.HasIndex(e => e.City, "City");
entity.HasIndex(e => e.CompanyName, "CompanyName");
entity.HasIndex(e => e.PostalCode, "PostalCode");
entity.HasIndex(e => e.Region, "Region");
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ContactName).HasMaxLength(30);
entity.Property(e => e.ContactTitle).HasMaxLength(30);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.Fax).HasMaxLength(24);
entity.Property(e => e.Phone).HasMaxLength(24);
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.Region).HasMaxLength(15);
});
modelBuilder.Entity<Invoice>(entity => {
entity.HasNoKey();
entity.ToView("Invoices");
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.CustomerName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ExtendedPrice).HasColumnType("money");
entity.Property(e => e.Freight).HasColumnType("money");
entity.Property(e => e.OrderDate).HasColumnType("datetime");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.ProductName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.Region).HasMaxLength(15);
entity.Property(e => e.RequiredDate).HasColumnType("datetime");
entity.Property(e => e.Salesperson)
.IsRequired()
.HasMaxLength(31);
entity.Property(e => e.ShipAddress).HasMaxLength(60);
entity.Property(e => e.ShipCity).HasMaxLength(15);
entity.Property(e => e.ShipCountry).HasMaxLength(15);
entity.Property(e => e.ShipName).HasMaxLength(40);
entity.Property(e => e.ShipPostalCode).HasMaxLength(10);
entity.Property(e => e.ShipRegion).HasMaxLength(15);
entity.Property(e => e.ShippedDate).HasColumnType("datetime");
entity.Property(e => e.ShipperName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.UnitPrice).HasColumnType("money");
});
modelBuilder.Entity<Order>(entity => {
entity.HasIndex(e => e.CustomerId, "CustomerID");
entity.HasIndex(e => e.CustomerId, "CustomersOrders");
entity.HasIndex(e => e.EmployeeId, "EmployeeID");
entity.HasIndex(e => e.EmployeeId, "EmployeesOrders");
entity.HasIndex(e => e.OrderDate, "OrderDate");
entity.HasIndex(e => e.ShipPostalCode, "ShipPostalCode");
entity.HasIndex(e => e.ShippedDate, "ShippedDate");
entity.HasIndex(e => e.ShipVia, "ShippersOrders");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.EmployeeId).HasColumnName("EmployeeID");
entity.Property(e => e.Freight)
.HasColumnType("money")
.HasDefaultValueSql("((0))");
entity.Property(e => e.OrderDate).HasColumnType("datetime");
entity.Property(e => e.RequiredDate).HasColumnType("datetime");
entity.Property(e => e.ShipAddress).HasMaxLength(60);
entity.Property(e => e.ShipCity).HasMaxLength(15);
entity.Property(e => e.ShipCountry).HasMaxLength(15);
entity.Property(e => e.ShipName).HasMaxLength(40);
entity.Property(e => e.ShipPostalCode).HasMaxLength(10);
entity.Property(e => e.ShipRegion).HasMaxLength(15);
entity.Property(e => e.ShippedDate).HasColumnType("datetime");
entity.HasOne(d => d.Customer)
.WithMany(p => p.Orders)
.HasForeignKey(d => d.CustomerId)
.HasConstraintName("FK_Orders_Customers");
entity.HasOne(d => d.ShipViaNavigation)
.WithMany(p => p.Orders)
.HasForeignKey(d => d.ShipVia)
.HasConstraintName("FK_Orders_Shippers");
});
modelBuilder.Entity<OrderDetail>(entity => {
entity.HasKey(e => new { e.OrderId, e.ProductId })
.HasName("PK_Order_Details");
entity.ToTable("Order Details");
entity.HasIndex(e => e.OrderId, "OrderID");
entity.HasIndex(e => e.OrderId, "OrdersOrder_Details");
entity.HasIndex(e => e.ProductId, "ProductID");
entity.HasIndex(e => e.ProductId, "ProductsOrder_Details");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.Quantity).HasDefaultValueSql("((1))");
entity.Property(e => e.UnitPrice).HasColumnType("money");
entity.HasOne(d => d.Order)
.WithMany(p => p.OrderDetails)
.HasForeignKey(d => d.OrderId)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Order_Details_Orders");
entity.HasOne(d => d.Product)
.WithMany(p => p.OrderDetails)
.HasForeignKey(d => d.ProductId)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Order_Details_Products");
});
modelBuilder.Entity<Product>(entity => {
entity.HasIndex(e => e.CategoryId, "CategoriesProducts");
entity.HasIndex(e => e.CategoryId, "CategoryID");
entity.HasIndex(e => e.ProductName, "ProductName");
entity.HasIndex(e => e.SupplierId, "SupplierID");
entity.HasIndex(e => e.SupplierId, "SuppliersProducts");
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.CategoryId).HasColumnName("CategoryID");
entity.Property(e => e.ProductName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.QuantityPerUnit).HasMaxLength(20);
entity.Property(e => e.ReorderLevel).HasDefaultValueSql("((0))");
entity.Property(e => e.SupplierId).HasColumnName("SupplierID");
entity.Property(e => e.UnitPrice)
.HasColumnType("money")
.HasDefaultValueSql("((0))");
entity.Property(e => e.UnitsInStock).HasDefaultValueSql("((0))");
entity.Property(e => e.UnitsOnOrder).HasDefaultValueSql("((0))");
entity.HasOne(d => d.Category)
.WithMany(p => p.Products)
.HasForeignKey(d => d.CategoryId)
.HasConstraintName("FK_Products_Categories");
entity.HasOne(d => d.Supplier)
.WithMany(p => p.Products)
.HasForeignKey(d => d.SupplierId)
.HasConstraintName("FK_Products_Suppliers");
});
modelBuilder.Entity<Shipper>(entity => {
entity.Property(e => e.ShipperId).HasColumnName("ShipperID");
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.Phone).HasMaxLength(24);
});
modelBuilder.Entity<Supplier>(entity => {
entity.HasIndex(e => e.CompanyName, "CompanyName");
entity.HasIndex(e => e.PostalCode, "PostalCode");
entity.Property(e => e.SupplierId).HasColumnName("SupplierID");
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ContactName).HasMaxLength(30);
entity.Property(e => e.ContactTitle).HasMaxLength(30);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.Fax).HasMaxLength(24);
entity.Property(e => e.HomePage).HasColumnType("ntext");
entity.Property(e => e.Phone).HasMaxLength(24);
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.Region).HasMaxLength(15);
});
modelBuilder.Entity<Employee>(entity => {
entity.HasIndex(e => e.EmployeeId, "EmployeeId");
entity.HasIndex(e => e.LastName, "LastName");
entity.HasIndex(e => e.FirstName, "FirstName");
entity.HasIndex(e => e.Title, "Title");
entity.HasIndex(e => e.BirthDate, "BirthDate");
entity.HasIndex(e => e.HireDate, "HireDate");
entity.HasIndex(e => e.Notes, "Notes");
});
OnModelCreatingPartial(modelBuilder);
}
partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}
}
using Microsoft.EntityFrameworkCore;
// ...
builder.Services.AddDbContextFactory<NorthwindContext>((sp, options) => {
var env = sp.GetRequiredService<IWebHostEnvironment>();
var dbPath = Path.Combine(env.ContentRootPath, "Northwind-5e44b51f.mdf");
options.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Integrated Security=true;AttachDbFileName=" + dbPath);
});
Run Demo: Grid - Interval Grouping
Watch Video: Grid - Group Data
You can also implement custom logic to group grid data.
Note
The Grid does not support grouping by display text and custom grouping when you use a a Server Mode data source.
The Grid does not support interval grouping, custom grouping, or grouping by display text when you use a GridDevExtremeDataSource.
Custom Grouping
Follow the steps below to implement custom logic used to group grid data.
- Set the
DxGridDataColumn.GroupInterval property to GridColumnGroupInterval.Custom.
- Handle the DxGrid.CustomGroup event and compare column values based on your custom logic. Use the event argument’s Value1 and Value2 properties to access the current column’s values. Call the GetRow1Value and GetRow2Value methods to obtain values of other columns. If the compared values belong to the same group, set the SameGroup property to
true.
- In the event handler, set the Handled property to
true to prevent the default comparison mechanism from being invoked.
You can also handle the CustomizeGroupValueDisplayText event to customize text for group rows.
The following code snippet implements custom group logic for the Unit Price column. Data are grouped for the following intervals: $0.00 - $10.00, $10.00 - $20.00, and so on.
@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable
<DxGrid Data="GridDataSource"
ShowGroupPanel="true"
CustomGroup="Grid_CustomGroup"
CustomizeGroupValueDisplayText="Grid_CustomizeGroupValueDisplayText">
<Columns>
<DxGridDataColumn FieldName="ProductName" />
<DxGridDataColumn FieldName="Country" />
<DxGridDataColumn FieldName="OrderDate"
DisplayFormat="d" />
<DxGridDataColumn FieldName="UnitPrice"
DisplayFormat="c"
GroupIndex="0"
GroupInterval="GridColumnGroupInterval.Custom" />
<DxGridDataColumn FieldName="Quantity" />
</Columns>
</DxGrid>
@code {
object GridDataSource { get; set; }
NorthwindContext Northwind { get; set; }
protected override void OnInitialized() {
Northwind = NorthwindContextFactory.CreateDbContext();
GridDataSource = Northwind.Invoices
.ToList();
}
void Grid_CustomGroup(GridCustomGroupEventArgs e) {
if(e.FieldName == "UnitPrice") {
e.SameGroup = Grid_CompareColumnValues(e.Value1, e.Value2) == 0;
e.Handled = true;
}
}
int Grid_CompareColumnValues(object value1, object value2) {
double val1 = Math.Floor(Convert.ToDouble(value1) / 10);
double val2 = Math.Floor(Convert.ToDouble(value2) / 10);
var res = System.Collections.Comparer.Default.Compare(val1, val2);
if(res < 0)
res = -1;
else if(res > 0)
res = 1;
if(res == 0 || (val1 > 9 && val2 > 9))
res = 0;
return res;
}
void Grid_CustomizeGroupValueDisplayText(GridCustomizeGroupValueDisplayTextEventArgs e) {
if(e.FieldName == "UnitPrice") {
double val = Math.Floor(Convert.ToDouble(e.Value) / 10);
string displayText = string.Format("{0:c} - {1:c} ", val * 10, (val + 1) * 10);
if(val > 9)
displayText = string.Format(">= {0:c} ", 100);
e.DisplayText = displayText;
}
}
public void Dispose() {
Northwind?.Dispose();
}
}
using Microsoft.EntityFrameworkCore;
#nullable disable
namespace Grid.Northwind {
public partial class NorthwindContext : DbContext {
public NorthwindContext(DbContextOptions<NorthwindContext> options)
: base(options) {
}
public virtual DbSet<Category> Categories { get; set; }
public virtual DbSet<Customer> Customers { get; set; }
public virtual DbSet<Invoice> Invoices { get; set; }
public virtual DbSet<Order> Orders { get; set; }
public virtual DbSet<OrderDetail> OrderDetails { get; set; }
public virtual DbSet<Product> Products { get; set; }
public virtual DbSet<Shipper> Shippers { get; set; }
public virtual DbSet<Supplier> Suppliers { get; set; }
public virtual DbSet<Employee> Employees { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) {
if(!optionsBuilder.IsConfigured) {
optionsBuilder.UseSqlServer("Server=.\\sqlexpress;Database=Northwind;Integrated Security=true");
}
}
protected override void OnModelCreating(ModelBuilder modelBuilder) {
modelBuilder.HasAnnotation("Relational:Collation", "SQL_Latin1_General_CP1_CI_AS");
modelBuilder.Entity<Category>(entity => {
entity.HasIndex(e => e.CategoryName, "CategoryName");
entity.Property(e => e.CategoryId).HasColumnName("CategoryID");
entity.Property(e => e.CategoryName)
.IsRequired()
.HasMaxLength(15);
entity.Property(e => e.Description).HasColumnType("ntext");
entity.Property(e => e.Picture).HasColumnType("image");
});
modelBuilder.Entity<Customer>(entity => {
entity.HasIndex(e => e.City, "City");
entity.HasIndex(e => e.CompanyName, "CompanyName");
entity.HasIndex(e => e.PostalCode, "PostalCode");
entity.HasIndex(e => e.Region, "Region");
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ContactName).HasMaxLength(30);
entity.Property(e => e.ContactTitle).HasMaxLength(30);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.Fax).HasMaxLength(24);
entity.Property(e => e.Phone).HasMaxLength(24);
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.Region).HasMaxLength(15);
});
modelBuilder.Entity<Invoice>(entity => {
entity.HasNoKey();
entity.ToView("Invoices");
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.CustomerName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ExtendedPrice).HasColumnType("money");
entity.Property(e => e.Freight).HasColumnType("money");
entity.Property(e => e.OrderDate).HasColumnType("datetime");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.ProductName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.Region).HasMaxLength(15);
entity.Property(e => e.RequiredDate).HasColumnType("datetime");
entity.Property(e => e.Salesperson)
.IsRequired()
.HasMaxLength(31);
entity.Property(e => e.ShipAddress).HasMaxLength(60);
entity.Property(e => e.ShipCity).HasMaxLength(15);
entity.Property(e => e.ShipCountry).HasMaxLength(15);
entity.Property(e => e.ShipName).HasMaxLength(40);
entity.Property(e => e.ShipPostalCode).HasMaxLength(10);
entity.Property(e => e.ShipRegion).HasMaxLength(15);
entity.Property(e => e.ShippedDate).HasColumnType("datetime");
entity.Property(e => e.ShipperName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.UnitPrice).HasColumnType("money");
});
modelBuilder.Entity<Order>(entity => {
entity.HasIndex(e => e.CustomerId, "CustomerID");
entity.HasIndex(e => e.CustomerId, "CustomersOrders");
entity.HasIndex(e => e.EmployeeId, "EmployeeID");
entity.HasIndex(e => e.EmployeeId, "EmployeesOrders");
entity.HasIndex(e => e.OrderDate, "OrderDate");
entity.HasIndex(e => e.ShipPostalCode, "ShipPostalCode");
entity.HasIndex(e => e.ShippedDate, "ShippedDate");
entity.HasIndex(e => e.ShipVia, "ShippersOrders");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.CustomerId)
.HasMaxLength(5)
.HasColumnName("CustomerID")
.IsFixedLength(true);
entity.Property(e => e.EmployeeId).HasColumnName("EmployeeID");
entity.Property(e => e.Freight)
.HasColumnType("money")
.HasDefaultValueSql("((0))");
entity.Property(e => e.OrderDate).HasColumnType("datetime");
entity.Property(e => e.RequiredDate).HasColumnType("datetime");
entity.Property(e => e.ShipAddress).HasMaxLength(60);
entity.Property(e => e.ShipCity).HasMaxLength(15);
entity.Property(e => e.ShipCountry).HasMaxLength(15);
entity.Property(e => e.ShipName).HasMaxLength(40);
entity.Property(e => e.ShipPostalCode).HasMaxLength(10);
entity.Property(e => e.ShipRegion).HasMaxLength(15);
entity.Property(e => e.ShippedDate).HasColumnType("datetime");
entity.HasOne(d => d.Customer)
.WithMany(p => p.Orders)
.HasForeignKey(d => d.CustomerId)
.HasConstraintName("FK_Orders_Customers");
entity.HasOne(d => d.ShipViaNavigation)
.WithMany(p => p.Orders)
.HasForeignKey(d => d.ShipVia)
.HasConstraintName("FK_Orders_Shippers");
});
modelBuilder.Entity<OrderDetail>(entity => {
entity.HasKey(e => new { e.OrderId, e.ProductId })
.HasName("PK_Order_Details");
entity.ToTable("Order Details");
entity.HasIndex(e => e.OrderId, "OrderID");
entity.HasIndex(e => e.OrderId, "OrdersOrder_Details");
entity.HasIndex(e => e.ProductId, "ProductID");
entity.HasIndex(e => e.ProductId, "ProductsOrder_Details");
entity.Property(e => e.OrderId).HasColumnName("OrderID");
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.Quantity).HasDefaultValueSql("((1))");
entity.Property(e => e.UnitPrice).HasColumnType("money");
entity.HasOne(d => d.Order)
.WithMany(p => p.OrderDetails)
.HasForeignKey(d => d.OrderId)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Order_Details_Orders");
entity.HasOne(d => d.Product)
.WithMany(p => p.OrderDetails)
.HasForeignKey(d => d.ProductId)
.OnDelete(DeleteBehavior.ClientSetNull)
.HasConstraintName("FK_Order_Details_Products");
});
modelBuilder.Entity<Product>(entity => {
entity.HasIndex(e => e.CategoryId, "CategoriesProducts");
entity.HasIndex(e => e.CategoryId, "CategoryID");
entity.HasIndex(e => e.ProductName, "ProductName");
entity.HasIndex(e => e.SupplierId, "SupplierID");
entity.HasIndex(e => e.SupplierId, "SuppliersProducts");
entity.Property(e => e.ProductId).HasColumnName("ProductID");
entity.Property(e => e.CategoryId).HasColumnName("CategoryID");
entity.Property(e => e.ProductName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.QuantityPerUnit).HasMaxLength(20);
entity.Property(e => e.ReorderLevel).HasDefaultValueSql("((0))");
entity.Property(e => e.SupplierId).HasColumnName("SupplierID");
entity.Property(e => e.UnitPrice)
.HasColumnType("money")
.HasDefaultValueSql("((0))");
entity.Property(e => e.UnitsInStock).HasDefaultValueSql("((0))");
entity.Property(e => e.UnitsOnOrder).HasDefaultValueSql("((0))");
entity.HasOne(d => d.Category)
.WithMany(p => p.Products)
.HasForeignKey(d => d.CategoryId)
.HasConstraintName("FK_Products_Categories");
entity.HasOne(d => d.Supplier)
.WithMany(p => p.Products)
.HasForeignKey(d => d.SupplierId)
.HasConstraintName("FK_Products_Suppliers");
});
modelBuilder.Entity<Shipper>(entity => {
entity.Property(e => e.ShipperId).HasColumnName("ShipperID");
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.Phone).HasMaxLength(24);
});
modelBuilder.Entity<Supplier>(entity => {
entity.HasIndex(e => e.CompanyName, "CompanyName");
entity.HasIndex(e => e.PostalCode, "PostalCode");
entity.Property(e => e.SupplierId).HasColumnName("SupplierID");
entity.Property(e => e.Address).HasMaxLength(60);
entity.Property(e => e.City).HasMaxLength(15);
entity.Property(e => e.CompanyName)
.IsRequired()
.HasMaxLength(40);
entity.Property(e => e.ContactName).HasMaxLength(30);
entity.Property(e => e.ContactTitle).HasMaxLength(30);
entity.Property(e => e.Country).HasMaxLength(15);
entity.Property(e => e.Fax).HasMaxLength(24);
entity.Property(e => e.HomePage).HasColumnType("ntext");
entity.Property(e => e.Phone).HasMaxLength(24);
entity.Property(e => e.PostalCode).HasMaxLength(10);
entity.Property(e => e.Region).HasMaxLength(15);
});
modelBuilder.Entity<Employee>(entity => {
entity.HasIndex(e => e.EmployeeId, "EmployeeId");
entity.HasIndex(e => e.LastName, "LastName");
entity.HasIndex(e => e.FirstName, "FirstName");
entity.HasIndex(e => e.Title, "Title");
entity.HasIndex(e => e.BirthDate, "BirthDate");
entity.HasIndex(e => e.HireDate, "HireDate");
entity.HasIndex(e => e.Notes, "Notes");
});
OnModelCreatingPartial(modelBuilder);
}
partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}
}
using Microsoft.EntityFrameworkCore;
// ...
builder.Services.AddDbContextFactory<NorthwindContext>((sp, options) => {
var env = sp.GetRequiredService<IWebHostEnvironment>();
var dbPath = Path.Combine(env.ContentRootPath, "Northwind-5e44b51f.mdf");
options.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Integrated Security=true;AttachDbFileName=" + dbPath);
});
Run Demo: Grid - Custom Grouping
Watch Video: Grid - Group Data
For more information about data grouping in the Grid component, refer to the following topic: Group Data in Blazor Grid.
See Also