DxComboBoxSettings.Data Property
Specifies the object that supplies combo box data.
Namespace: DevExpress.Blazor
Assembly:
DevExpress.Blazor.v24.1.dll
NuGet Package:
DevExpress.Blazor
Declaration
[DefaultValue(null)]
[Parameter]
public object Data { get; set; }
Property Value
Type |
Default |
Description |
Object |
null |
A data collection that implements the IEnumerable interface.
|
Specify the following settings to bind the combo box editor to data:
Data
- Specifies the object that supplies combo box data.
- TextFieldName
- Specifies the data source field that contains text for combo box items.
- ValueFieldName
- Specifies the name of the data source field that contains combo box values.
The following code snippet configures DxComboBoxSettings and display values from an external collection in a Grid column:
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
<DxGrid Data="Products"
EditMode="GridEditMode.EditRow">
<Columns>
<DxGridCommandColumn />
<DxGridDataColumn FieldName="CategoryId" Caption="Category">
<EditSettings>
<DxComboBoxSettings Data="Categories"
ValueFieldName="CategoryId"
TextFieldName="CategoryName"/>
</EditSettings>
</DxGridDataColumn>
<DxGridDataColumn FieldName="ProductName" />
<DxGridDataColumn FieldName="UnitPrice" />
<DxGridDataColumn FieldName="UnitsInStock" />
<DxGridDataColumn FieldName="QuantityPerUnit" />
</Columns>
</DxGrid>
@code {
NorthwindContext Northwind { get; set; }
List<Product> Products { get; set; }
List<Category> Categories { get; set; }
protected override async Task OnInitializedAsync() {
Northwind = NorthwindContextFactory.CreateDbContext();
Products = await Northwind.Products.ToListAsync();
Categories = await Northwind.Categories.ToListAsync();
}
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<Product> Products { 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<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");
});
// ...
OnModelCreatingPartial(modelBuilder);
}
partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}
}
public partial class Product {
public Product() {
OrderDetails = new HashSet<OrderDetail>();
}
public int ProductId { get; set; }
public string ProductName { get; set; }
public int? SupplierId { get; set; }
public int? CategoryId { get; set; }
public string QuantityPerUnit { get; set; }
public decimal? UnitPrice { get; set; }
public short? UnitsInStock { get; set; }
public short? UnitsOnOrder { get; set; }
public short? ReorderLevel { get; set; }
public bool Discontinued { get; set; }
public virtual Category Category { get; set; }
}
public partial class Category {
public Category() {
Products = new HashSet<Product>();
}
public int CategoryId { get; set; }
public string CategoryName { get; set; }
public string Description { get; set; }
public byte[] Picture { get; set; }
public virtual ICollection<Product> Products { get; set; }
}
To change the object that supplies combo box data at runtime, use the IComboBoxSettings.Data property.
See Also