Question

我尝试使用asp c#.net从mssql数据库绑定telerik自动填充文本框。

<telerik:RadAutoCompleteBox AllowCustomEntry="true" ID="RadAutoCompleteBox2" runat="server" InputType="Text">
    <TextSettings SelectionMode="Single" />
</telerik:RadAutoCompleteBox>

我的.aspx.cs文件的代码如下所示

protected void Page_Load(object sender, EventArgs e)
{
    try
    {   
        SqlDataSource SqlDataSource1 = new SqlDataSource();
        SqlDataSource1.ID = "SqlDataSource1";
        this.Page.Controls.Add(SqlDataSource1);
        SqlDataSource1.ConnectionString = "my connection";
        SqlDataSource1.SelectCommand = "select citylocation from citylocationtbl where cityname=@cityname";
        SqlDataSource1.SelectParameters.Add("@cityname", Request.QueryString["city"].ToString());
        RadAutoCompleteBox2.DataSourceID = "SqlDataSource1";
        RadAutoCompleteBox2.DataTextField = "citylocation";
        RadAutoCompleteBox2.DataBind();
    }
    catch (Exception ex)
    {
    }
}

当我删除参数时，代码工作正常，但在参数行I中仍然出现错误。

已声明变量名@cityname。变量名在查询批处理或存储过程中必须是唯一的。

我收到错误，因为当我按任意键telerik autosuggesbox时会自动回复并一次又一次地绑定数据。

Answer 1

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LoadCity(Request.QueryString["city"].ToString());
    }

}

protected void LoadCity(string _city)
{
    try
    {
        SqlDataSource SqlDataSource1 = new SqlDataSource();
        SqlDataSource1.ID = "SqlDataSource1";
        this.Page.Controls.Add(SqlDataSource1);
        SqlDataSource1.ConnectionString = "my connection";
        SqlDataSource1.SelectCommand = "select citylocation from citylocationtbl where cityname=@cityname";
        SqlDataSource1.SelectParameters.Add("@cityname", _city);
        RadAutoCompleteBox2.DataSourceID = "SqlDataSource1";
        RadAutoCompleteBox2.DataTextField = "citylocation";
        RadAutoCompleteBox2.DataBind();
    }
    catch (Exception ex)
    {

    }

}

自动回发：给出已声明变量名称的错误

1 个答案: