不支持Telerik.Web.UI.RadComboBoxContext,因为它实现了IDictionary

Question

private const int ItemsPerRequest = 10;
[WebMethod]
public RadComboBoxItemData[] GetAccount(object context)
{
    RadComboBoxContext obj = (RadComboBoxContext)context;
    DataTable data = GetDataAccount(obj.Text);

    RadComboBoxData comboData = new RadComboBoxData();
    int itemOffset = obj.NumberOfItems;
    int endOffset = Math.Min(itemOffset + ItemsPerRequest, data.Rows.Count);
    comboData.EndOfItems = endOffset == data.Rows.Count;

    List result = new List(endOffset - itemOffset);

    for (int i = itemOffset; i < endOffset; i++)
    {
        RadComboBoxItemData itemData = new RadComboBoxItemData();
        itemData.Value = data.Rows[i]["AccountLevelNo"].ToString();
        itemData.Text = data.Rows[i]["AccountDesc3"].ToString();
        itemData.Attributes.Add("Level6", data.Rows[i]["AccountDesc2"].ToString());
        itemData.Attributes.Add("Level1", data.Rows[i]["AccountDesc1"].ToString());

        result.Add(itemData);
    }

    comboData.Items = result.ToArray();
    // comboData.Message = GetStatusMessage(endOffset, data.Rows.Count);

    return comboData.Items.ToArray();
}

private static DataTable GetDataAccount(string text)
{
    int accCode = 0;
    string query = "select COA.LevelAccountNo,COA.AccountDesc as AccountDesc3,Level1.AccountDesc as AccountDesc1, Level2.AccountDesc as AccountDesc2 from COA COA,(select LevelAccountNo,AccountDesc " +
        "from COA where len(LevelAccountNo)=2)as Level1,(select LevelAccountNo,AccountDesc from COA where len(LevelAccountNo)=5)as Level2 " +
        "where Level1.LevelAccountNo=left(COA.LevelAccountNo,2)and Level2.LevelAccountNo=left(COA.LevelAccountNo,5) and len(COA.LevelAccountNo)>6";

    try
    {
        accCode = Convert.ToInt32(text);
        query = query + " COA.LevelAccountNo like '" + text + "%'";     
    }
    catch (Exception ex)
    {
        query = query + " COA.AccountDesc3 like '%" + text + "%'"; 
    }

    SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"].ToString());
    // string constr=ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

    SqlDataAdapter adapter = new SqlDataAdapter(query, con);
    // adapter.SelectCommand.Parameters.AddWithValue("@text", text);

    DataTable data = new DataTable();
    adapter.Fill(data);
    con.Close();
    return data;
}

这是我的网络服务代码

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<telerik:RadComboBox ID="cboAccount"  runat="server" Height="200" Width="200" EmptyMessage="Select an Account"
  EnableLoadOnDemand="true" ShowMoreResultsBox="true" EnableVirtualScrolling="true">
    <HeaderTemplate>
        <h3>Accounts</h3>
    </HeaderTemplate>
    <ClientItemTemplate>
        <div>
            <ul>
                <li><span><b>Name:#= Text # </b></span></li>
                <li><span>Level6 #= Attributes.Level6 # </span></li>
                <li><span>Level1: #= Attributes.Level4 # </span></li>
                <li><span>Level4 #= Attributes.Level1 # </span></li>
            </ul>
        </div>
    <br></br>
    </ClientItemTemplate>
    <WebServiceSettings Method="GetAccount" Path="InvestmentDropDownWebService.asmx" />
</telerik:RadComboBox>

我在我的项目中第一次使用webservice.我不知道如何解决这个错误.如果我正在运行,aspx.cs这完全正在运行,并且值绑定在组合框中.但是当我通过使用Web服务将值绑定到组合框时,它会给出一个错误:

不支持Telerik.Web.UI.RadComboBoxContext类型,因为它实现了IDictionary.

Answer 1

此问题是由 Visual Studio 调试器引起的。这是因为它的默认行为。有一个解决方法。改变你的线路

[WebMethod]

到

[WebMethod(EnableSession = true)]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]

另外，添加一个属性

WebServiceSettings-UseHttpGet="true"

在 RadCombo Box 的 ASPX 代码中。有关此问题的更多详细信息，
请参阅Telerik 论坛中的此问题