树状列表中的DevExpress组合框已禁用

如何解决树状列表中的DevExpress组合框已禁用

| 我尝试使用以下代码在我的TreeList中显示一个组合框：

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，该组合保持为空，它显示\'[无数据] \'。当我在数据源上设置断点时，我看到该数据源已满。 我究竟做错了什么？     

解决方法

        您的大多数代码看起来都不错，所以我怀疑它可能是缺少的字段名或数据源出现问题。 以下是一个很小的示例，其中大多数是代码的直接副本（略有缩进），但是我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unbound模式，我将一些节点添加到树中，否则将绑定到数据源，并在permitColumn上设置字段名称。

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; }
}

    ,        那是因为您将列设置为“未绑定”

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

    ,        我只是返回并签出了“查找编辑器”-我很确定您需要在出现任何数据之前手动创建列。 DevExpress LookupEditor不是一个简单的下拉列表，它基本上是嵌入式网格控件。如果您要显示的商品列表中只有一个属性，则可能是这样的：

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