树列表中的DevExpress组合框已禁用

本文关键字：组合 DevExpress 列表 | 更新日期: 2023-09-27 17:59:25

我试图在树列表中显示一个组合框，代码是：

RepositoryItemLookUpEdit rep = new RepositoryItemLookUpEdit();
rep.TextEditStyle = TextEditStyles.DisableTextEditor;
//rep = new RepositoryItemComboBox();
//rep.Items.AddRange(new SecuredObject<QuestionnaireCategory>().PermissionType);
//rep.Items.AddRange(new object[] { "A", "B", "C" });

treeList1.RepositoryItems.Add(rep);
TreeListColumn disciplineColumn = treeList1.Columns.Add();
disciplineColumn.Caption = "Discipline";
disciplineColumn.Visible = true;
disciplineColumn.FieldName = "Entity.Description";
disciplineColumn.OptionsColumn.AllowEdit = false;
TreeListColumn permissionColumn = treeList1.Columns.Add();
permissionColumn.Caption = "Permissie";
permissionColumn.Visible = true;
permissionColumn.Name = "Permission";
//permissionColumn.FieldName = "PermissionType";
permissionColumn.UnboundType = UnboundColumnType.Object;
permissionColumn.ColumnEdit = rep;
//permissionColumn.OptionsColumn.ReadOnly = false;
//permissionColumn.OptionsColumn.AllowEdit = true;
rep.DataSource = permissions;
rep.DisplayMember = "Description";
rep.ValueMember = "Id";
rep.Name = "ola";
rep.ThrowExceptionOnInvalidLookUpEditValueType = true;

但是，组合框仍然为空，它显示"[无数据]"。当我在数据源上设置断点时，我会看到数据源已填充。

我做错了什么？

树列表中的DevExpress组合框已禁用

您的大部分代码看起来都不错，所以我怀疑可能是缺少字段名或数据源有问题。

以下是一个小示例，其中大部分是您代码的直接副本（略微缩进），但我正在运行时创建树列表，并创建了一个示例通用列表，用作测试它的数据源。

在构造函数的末尾，对于未绑定模式，我向树中添加一些节点，否则我将绑定到数据源并在permissionColumn上设置字段名。

using System;
using System.Windows.Forms;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraTreeList.Columns;
using DevExpress.XtraEditors.Controls;
using DevExpress.XtraTreeList.Data;
public class Form1 : Form
{
    [STAThread]
    static void Main()
    {
        Application.Run(new Form1());
    }
     public Form1()
    {
        this.ClientSize = new System.Drawing.Size(700, 500);
        DevExpress.XtraTreeList.TreeList treeList1 = new DevExpress.XtraTreeList.TreeList();
        this.Controls.Add(treeList1);
        treeList1.Dock = DockStyle.Fill;
        var permissions = new System.Collections.Generic.List<TestClass>();
        permissions.Add(new TestClass() { Id = 1 , Description = "Permission 1" });
        permissions.Add(new TestClass() { Id = 99, Description = "Permission 99" });
        var list = new System.Collections.Generic.List<TestClass2>();
        list.Add(new TestClass2() { Id = 1 , PermissionId = 1 , Description2 = "List Desc 1" });
        list.Add(new TestClass2() { Id = 2 , PermissionId = 99, Description2 = "List Desc 2" });

                // Your code
                RepositoryItemLookUpEdit rep = new RepositoryItemLookUpEdit();
                rep.TextEditStyle = TextEditStyles.DisableTextEditor;
                //rep = new RepositoryItemComboBox();
                //rep.Items.AddRange(new SecuredObject<QuestionnaireCategory>().PermissionType);
                //rep.Items.AddRange(new object[] { "A", "B", "C" });

                treeList1.RepositoryItems.Add(rep);
                TreeListColumn disciplineColumn = treeList1.Columns.Add();
                disciplineColumn.Caption = "Discipline";
                disciplineColumn.Visible = true;
                disciplineColumn.FieldName = "Entity.Description";
                disciplineColumn.OptionsColumn.AllowEdit = false;
                TreeListColumn permissionColumn = treeList1.Columns.Add();
                permissionColumn.Caption = "Permissie";
                permissionColumn.Visible = true;
                permissionColumn.Name = "Permission";
                //permissionColumn.FieldName = "PermissionType";
                permissionColumn.UnboundType = UnboundColumnType.Object;
                permissionColumn.ColumnEdit = rep;
                //permissionColumn.OptionsColumn.ReadOnly = false;
                //permissionColumn.OptionsColumn.AllowEdit = true;
                rep.DataSource = permissions;
                rep.DisplayMember = "Description";
                rep.ValueMember = "Id";
                rep.Name = "ola";
                rep.ThrowExceptionOnInvalidLookUpEditValueType = true;
                // End Your code

        disciplineColumn.FieldName = "Description2";
        bool unBoundMode = false;
        if (unBoundMode)
        {
            treeList1.AppendNode(new object[] { "Item1", 1 }, -1);
            treeList1.AppendNode(new object[] { "Item2", 99 }, -1);
        }
        else
        {
            treeList1.DataSource = list;
            permissionColumn.FieldName = "PermissionId";
        }

    }
}
public class TestClass
{
    public int Id             { get; set; }
    public string Description { get; set; }
}

public class TestClass2
{
    public int Id { get; set; }
    public int PermissionId { get; set; }
    public string Description2 { get; set; }
}

这是因为您将列设置为Unbound

...
permissionColumn.UnboundType = UnboundColumnType.Object;
...

我刚刚返回并签出了Lookup Editors——我确信在任何数据出现之前，您需要手动创建列。DevExpress LookupEditor不是一个简单的下拉列表，它基本上是一个嵌入式网格控件。如果你的物品列表上只有一个属性可以显示，它应该是这样的：

  rep.Columns.Add(new LookupColumnInfo("PropertyName", 0));
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