DataTable中的DataView.RowFilter不返回已过滤的记录

Question

我有一个DataTable dt,其中有1200条记录.以下是代码:

DataTable dt = new DataTable();
dt = GetAccCode(c);

现在,使用DataView我想根据1列过滤dt的记录.以下是代码:

EDITED

 DataView dv = new DataView(dt);
    dv.RowFilter = "AccountDescription LIKE '" + e.Text + "' " ;
    dv.RowFilter = "Isnull(AccountDescription,'NULL') <> 'NULL'";

    //dv.RowStateFilter = DataViewRowState.ModifiedCurrent;  
    if (dv.Count > 0)
    {
        dt = dv.ToTable(); 
    }

完整代码:
C#CODE:

private const int ItemsPerRequest = 50;

    private static string GetStatusMessage(int offset, int total)
    {
        if (total <= 0)
            return "No matches";

        return String.Format("Items <b>1</b>-<b>{0}</b> out of <b>{1}</b>", offset, total);
    }

    public DataTable GetTable()
    {
        //  columns.
        DataTable table = new DataTable();
        table.Columns.Add("AccountCodeID", typeof(Guid));
        table.Columns.Add("AccountDescription", typeof(string));
        // DataRows.
        table.Rows.Add(Guid.NewGuid(), "9830.58578 Furniture&Food counter ");
        table.Rows.Add(Guid.NewGuid(), "09.323232 New-release add ons");
        table.Rows.Add(Guid.NewGuid(), "84.238799 G&D - Depot from Outerjoin");
        table.Rows.Add(Guid.NewGuid(), "141.44445043-Random&Access-Memory hydero 048kkjug ");
        table.Rows.Add(Guid.NewGuid(), "142.85223 Account's hyqure");
        table.Rows.Add(Guid.NewGuid(), "324.989384934 F&D Admin-Dept Working ");
        table.Rows.Add(Guid.NewGuid(), "77.234434 Unique's Question why not's so");
        return table;
    }

    protected void ddlAccountCode_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
    {
        string c = ddlCompany.SelectedValue.ToString();

        DataTable dt = GetTable();
        DataView dv = new DataView(dt);
        string searchParamText = e.Text;
        dv.RowFilter = string.Format("AccountDescription LIKE '%{0}%'", searchParamText);
        //dv.RowStateFilter = DataViewRowState.ModifiedCurrent;

        int a = dv.Count;
        if (dv.Count > 0)
        {
            dt = dv.ToTable();
        }

        RadComboBox combo = (RadComboBox)sender;

        int itemOffset = e.NumberOfItems;
        int endOffset = Math.Min(itemOffset + ItemsPerRequest, dt.Rows.Count);
        e.EndOfItems = endOffset == dt.Rows.Count;

        for (int i = itemOffset; i < endOffset; i++)
        {
            combo.Items.Add(new RadComboBoxItem(dt.Rows[i]["AccountDescription"].ToString(), dt.Rows[i]["AccountDescription"].ToString()));
        }

        e.Message = GetStatusMessage(endOffset, dt.Rows.Count); 
    }

HTML代码:

    <EditItemTemplate>
         <asp:Label ID="lblAcCode2" runat="server" Text='<%# Eval("AccountCode") + " - " + Eval("AccountDescription")%>' Visible="false"> 
         </asp:Label>

         <telerik:RadComboBox ID="ddlAccountCode" runat="server" Height="200" Width="240" DropDownWidth="310" HighlightTemplatedItems="true" CausesValidation="true" OnItemsRequested="ddlAccountCode_ItemsRequested" ItemsPerRequest="10" EnableLoadOnDemand="True" ShowMoreResultsBox="true" EnableVirtualScrolling="true" Filter="Contains" AppendDataBoundItems="true" DataTextField="AccountDescription" DataValueField="AccountCodeID">
         </telerik:RadComboBox> 

    </EditItemTemplate>

但每次dt都会返回所有1200条记录,而不是过滤后的记录.

要求:当我点击RadComboBox时,它会进入_ItemRequested事件.我希望在我搜索RadComboBox中的任何记录时,如果记录在DataTable中,那么它将转到GetStatusMessageELSE部分,或者如果搜索记录不在DataTable中那么它应该转到GetStatusMessageIF部分.
要从DataTable获取RadComboBox的搜索记录,我使用的是DataView.RowFilter方法,但每当我在RadCombo中键入任何文本时,它都不会返回搜索到的值并始终显示DataView.Count = 0

请回复如何解决此问题.我被困2天了.

Answer 1

我相信这可以解决你的问题.

DataTable dt = new DataTable();
dt = GetAccCode(c);
DataView dv = new DataView(dt);
dv.RowFilter = "AccountDescription LIKE '%" + e.Text + "%'" ;
dv.RowFilter = "Isnull(AccountDescription,'') <> ''";

dv.RowStateFilter = DataViewRowState.ModifiedCurrent;  
if (dv.Count > 0)
{
   dt = dv.ToTable(); 
}

仅出于测试目的,您还可以对值进行硬编码,并查看它是否会更改结果.例如:

dv.RowFilter = "AccountDescription LIKE '%mo%'" ;

并省略或评论该行

//dv.RowFilter = "Isnull(AccountDescription,'') <> ''";

看看你得到了什么结果.