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DxGrid.PageSizeChanged Event
Fires when the page size changes.
Namespace : DevExpress.Blazor
Assembly :
DevExpress.Blazor.v24.2.dll
NuGet Package :
DevExpress.Blazor
# Declaration
C#
[Parameter ]
public EventCallback<int > PageSizeChanged { get ; set ; }
# Parameters
The PageSizeChanged
event fires each time the PageSize property value changes. The event is handled automatically when you use two-way data binding for the PageSize
property (@bind-PageSize
).
You can also handle this event to create a custom response to page size changes.
The following example displays an informational message when a user selects a new value in the page size selector.
@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@ implements IDisposable
<div > <b > @ PageSizeInfo</b > </div >
<DxGrid Data ="@ Data"
PageSize ="@ PageSize"
PageSizeSelectorVisible ="true"
PageSizeSelectorItems ="@( new int [] { 5 , 10 , 15 }) "
PageSizeChanged ="OnPageSizeChanged" >
<Columns >
<DxGridDataColumn FieldName ="ShipName" />
<DxGridDataColumn FieldName ="ShipCity" />
<DxGridDataColumn FieldName ="ShipCountry" />
<DxGridDataColumn FieldName ="Freight" />
<DxGridDataColumn FieldName ="OrderDate" />
<DxGridDataColumn FieldName ="ShippedDate" />
</Columns >
</DxGrid >
@ code {
object Data { get ; set ; }
NorthwindContext Northwind { get ; set ; }
int PageSize { get ; set ; } = 10 ;
string PageSizeInfo { get ; set ; } = "Page size is 10" ;
protected override void OnInitialized ( ) {
Northwind = NorthwindContextFactory.CreateDbContext();
Data = Northwind.Orders.ToList();
}
void OnPageSizeChanged (int newPageSize ) {
PageSizeInfo = "Page size was changed from " + PageSize + " to " + newPageSize;
PageSize = newPageSize;
}
public void Dispose ( ) {
Northwind?.Dispose();
}
}
using System ;
using System.Collections.Generic ;
#nullable disable
namespace Grid.Northwind {
public partial class Order {
public Order ( ) {
OrderDetails = new HashSet<OrderDetail>();
}
public int OrderId { get ; set ; }
public string CustomerId { get ; set ; }
public int ? EmployeeId { get ; set ; }
public DateTime? OrderDate { get ; set ; }
public DateTime? RequiredDate { get ; set ; }
public DateTime? ShippedDate { get ; set ; }
public int ? ShipVia { get ; set ; }
public decimal ? Freight { get ; set ; }
public string ShipName { get ; set ; }
public string ShipAddress { get ; set ; }
public string ShipCity { get ; set ; }
public string ShipRegion { get ; set ; }
public string ShipPostalCode { get ; set ; }
public string ShipCountry { get ; set ; }
public virtual Customer Customer { get ; set ; }
public virtual Shipper ShipViaNavigation { 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<Order> Orders { 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<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" );
});
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);
});
For more information about paging in the Grid component, refer to the following topic: Paging in Blazor Grid .
See Also