GridCommandColumnCellDisplayTemplateContext.EditEnabled Property

Returns whether the Edit operation is available for a row from an asynchronous data source.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public bool EditEnabled { get; }

Property Value

Type	Description
Boolean	true if the edit operation is available; otherwise, false.

Remarks

A command column contains the predefined CRUD-related buttons (New, Edit, and Delete). You can define the column’s CellDisplayTemplate to implement custom command elements in cells that correspond to data rows.

Edit and Delete operations can be temporarily unavailable if you bind the Grid to an asynchronous data source (such as a Server Mode data source or GridDevExtremeDataSource). The EditEnabled and DeleteEnabled context parameters return false while the corresponding operation cannot be performed. Once Edit and Delete operations become available, these parameters return true.

In the template, use the EditEnabled and DeleteEnabled parameters to specify the enabled or disabled state for custom command elements. In the same way, you can use the NewEnabled parameter in the command column’s HeaderTemplate.

Razor

@using Microsoft.EntityFrameworkCore
@using DevExpress.Data.Linq
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable

<DxGrid Data="InstantFeedbackSource"
        EditModelSaving="OnEditModelSaving"
        DataItemDeleting="OnDataItemDeleting"
        KeyFieldName="OrderId"
        EditMode="GridEditMode.EditRow"> 
    <Columns>
        <DxGridCommandColumn Width="150px">
            <HeaderTemplate>
                <DxButton Click="() => context.Grid.StartEditNewRowAsync()"
                          Enabled="context.NewEnabled" Text="Add" />
            </HeaderTemplate>
            <CellDisplayTemplate>
                @{
                    <DxButton Click="() => context.Grid.StartEditDataItemAsync(context.DataItem)"
                              Text="Edit" Enabled="context.EditEnabled"/>
                    <DxButton Click="() => context.Grid.ShowDataItemDeleteConfirmation(context.DataItem)"
                              Text="Delete" Enabled="context.DeleteEnabled"/>
                }
            </CellDisplayTemplate>
        </DxGridCommandColumn>
        <DxGridDataColumn FieldName="ShipName" />
        <DxGridDataColumn FieldName="ShipCountry" />
        <DxGridDataColumn FieldName="Freight"  />
        <DxGridDataColumn FieldName="OrderDate" />
    </Columns>
</DxGrid>

@code {
    EntityInstantFeedbackSource InstantFeedbackSource { get; set; }
    NorthwindContext Northwind { get; set; }

    protected override void OnInitialized() {
        Northwind = NorthwindContextFactory.CreateDbContext();
        InstantFeedbackSource = new EntityInstantFeedbackSource(e => {
            e.KeyExpression = "OrderId";
            e.QueryableSource = Northwind.Orders;
        });
    }

    async Task OnEditModelSaving(GridEditModelSavingEventArgs e) {
        var editModel = (Order)e.EditModel;
        var dataItem = e.IsNew ? new Order() : Northwind.Orders.Find(editModel.OrderId);
        if (dataItem != null) {
            dataItem.ShipName = editModel.ShipName;
            dataItem.ShipCountry = editModel.ShipCountry;
            dataItem.Freight = editModel.Freight;
            dataItem.OrderDate = editModel.OrderDate;
            if (e.IsNew)
                await Northwind.AddAsync(dataItem);
            await Northwind.SaveChangesAsync();
        }
    }

    async Task OnDataItemDeleting(GridDataItemDeletingEventArgs e) {
        var dataItem = Northwind.Orders.Find((e.DataItem as Order).OrderId);
        if (dataItem != null) {
            Northwind.Remove(dataItem);
            await Northwind.SaveChangesAsync();
        }
    }

    public void Dispose() {
        InstantFeedbackSource?.Dispose();
        Northwind?.Dispose();
    }
}

Employee

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Grid.Northwind {
    public partial class Employee {
        public int EmployeeId { get; set; }
        [Required]
        public string LastName { get; set; }
        [Required]
        public string FirstName { get; set; }
        [Required]
        public string Title { get; set; }
        public string TitleOfCourtesy { get; set; }
        public Nullable<System.DateTime> BirthDate { get; set; }
        [Required]
        [Range(typeof(DateTime), "1/1/2000", "1/1/2020",
        ErrorMessage = "HireDate must be between {1:d} and {2:d}")]
        public Nullable<System.DateTime> HireDate { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string Region { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string HomePhone { get; set; }
        public string Extension { get; set; }
        public byte[] Photo { get; set; }
        public string Notes { get; set; }
        public Nullable<int> ReportsTo { get; set; }
        public string PhotoPath { get; set; }
        public virtual ICollection<Order> Orders { get; set; }
        public string Text => $"{FirstName} {LastName} ({Title})";
        public string ImageFileName => $"Employees/{EmployeeId}.jpg";
    }
}

NorthwindContext

using Microsoft.EntityFrameworkCore;
#nullable disable

namespace Grid.Northwind {
    public partial class NorthwindContext : DbContext {

        public NorthwindContext(DbContextOptions<NorthwindContext> options)
            : base(options) {
        }
        // ...
        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<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);
    }
}

Program.cs

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);
});

Tip

For more information on how to enable data editing, refer to the following topic: Editing and Validation in Blazor Grid.