DxGrid.DeselectRows(IEnumerable<Int32>) Method
Namespace: DevExpress.Blazor
Assembly:
DevExpress.Blazor.v21.2.dll
NuGet Package:
DevExpress.Blazor
Declaration
public void DeselectRows(
IEnumerable<int> visibleIndexes
)
Parameters
Name |
Type |
Description |
visibleIndexes |
IEnumerable<Int32> |
Specifies a collection of row visible indexes.
|
Call the DeselectRows
method and pass a collection of row visible indexes to remove these rows from selection. To select rows by their visible indexes, call the SelectRows method.
Note
When the Grid calculates visible indexes, it counts data rows and group rows. However, only data rows can be selected.
To access data items that correspond to selected rows, implement two-way binding for the SelectedDataItems property or handle the SelectedDataItemsChanged event.
The following example selects and deselects rows whose indexes are between 3 and 5:
@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable
<DxGrid Data="GridDataSource"
AllowSelectRowByClick="true"
@bind-SelectedDataItems="@SelectedDataItems"
KeyFieldName="ProductId"
@ref="MyGrid">
<Columns>
<DxGridDataColumn FieldName="ProductName" />
<DxGridDataColumn FieldName="UnitPrice" />
<DxGridDataColumn FieldName="QuantityPerUnit" />
<DxGridDataColumn FieldName="UnitsInStock" />
</Columns>
</DxGrid>
<br />
<DxButton Click="() => MyGrid.SelectRows(RowIndexes)">Select Rows 4-6</DxButton>
<DxButton Click="() => MyGrid.DeselectRows(RowIndexes)">Deselect Rows 4-6</DxButton>
@code {
IEnumerable<object> GridDataSource { get; set; }
NorthwindContext Northwind { get; set; }
IReadOnlyList<object> SelectedDataItems { get; set; }
IGrid MyGrid { get; set; }
int[] RowIndexes { get; set; } = new int[] { 3, 4, 5 };
protected override void OnInitialized() {
Northwind = NorthwindContextFactory.CreateDbContext();
GridDataSource = Northwind.Products
.ToList();
SelectedDataItems = GridDataSource.Skip(1).Take(2).ToList();
}
public void Dispose() {
Northwind?.Dispose();
}
}
using System;
using System.Collections.Generic;
#nullable disable
namespace Grid.Northwind {
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 virtual Supplier Supplier { get; set; }
public virtual ICollection<OrderDetail> OrderDetails { get; set; }
}
}
using Microsoft.EntityFrameworkCore;
#nullable disable
namespace Grid.Northwind {
public partial class NorthwindContext : DbContext {
public NorthwindContext(DbContextOptions<NorthwindContext> options)
: base(options) {
}
// ...
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.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");
});
// ...
OnModelCreatingPartial(modelBuilder);
}
partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}
}
using Microsoft.EntityFrameworkCore;
// ...
public class Startup {
// ...
public void ConfigureServices(IServiceCollection services) {
// ...
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);
});
}
// ...
}
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);
});
You can also call the following methods to manage selection:
Run Demo: Data Grid - Selection API
Note
When you use a GridDevExtremeDataSource, do not call the DeselectRows
method for rows that are outside the visible display range. The GridDevExtremeDataSource
loads only data required to display the current page. If you have references to the corresponding data items, you can call the DeselectDataItems(IEnumerable<Object>) method.
See Also