Question

iam尝试将gridview标签作为参数在sql中根据该标签进行更新但是它显示错误，因为从对象类型System.Web.UI.WebControls.Label到已知的托管提供者本机类型存在No mapping。请帮我提前谢谢以下是我的代码

protected void btnSave_Click(object sender, EventArgs e)
{

    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnStrCCUKYC"].ToString()))
    {

        foreach (GridViewRow row in ShowGrid.Rows)
        {


            var Clientid = row.Cells[5].FindControl("lblClientid");

           // var Clientid = row.Cells[5].Text;  Clientid is coming Null 

            //Label Clientid = ((Label)row.FindControl("lblClientid")); No mapping exists from object type System.Web.UI.WebControls.Label to a known managed provider native type.

            CheckBox ckb = (CheckBox)row.FindControl("chkSelect");
            //ckb.Checked = ((CheckBox)sender).Checked;

            if (ckb.Checked==true)
            {

                var check = true;

                SqlCommand cmd = new SqlCommand("sp_InsertRecieved_HOSignaturecard ", con);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@Check", check);
                cmd.Parameters.AddWithValue("@Clientid", Clientid);
                con.Open();
                var res = cmd.ExecuteNonQuery();
                con.Close();
                if (res > 0)
                {

                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertmsg", "alertify.alert('Data Saved successfully..!')", true);
                }

                else
                {
                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertmsg", "alertify.alert('Data NotSaved..!')", true);
                }


            }

            else
            {

                var check = false;

                SqlCommand cmd = new SqlCommand("sp_InsertRecieved_HOSignaturecard ", con);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@Check", check);
                cmd.Parameters.AddWithValue("@Clientid", Clientid);
                con.Open();
                var res = cmd.ExecuteNonQuery();
                con.Close();
                if (res > 0)
                {

                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertmsg", "alertify.alert('Data Saved successfully..!')", true);
                }

                else
                {
                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertmsg", "alertify.alert('Data NotSaved..!')", true);
                }   

            }

        }

    }


}

Answer 1

protected String doInBackground(String... params) {
    RestClient client = new RestClient(params[0]);

    client.AddParam("username", params[1]);
    client.AddParam("password", params[2]);

    ...
}

上面的代码示例假定您的ASPX标记已正确完成。如果您仍然无法获得正确的价值，请在您的问题中提供您的ASPX代码。

<强>更新

对于UPDATE，INSERT和DELETE语句，返回值为受命令影响的行数。当a上存在触发器时正在插入或更新的表，返回值包括数字受插入或更新操作影响的行数和数字受触发器或触发器影响的行数。对于所有其他类型的语句，返回值为-1。如果发生回滚，则返回值也是-1。

如果您的var lblClientid = row.cells[5].Controls[0].FindControl("lblClientid") as Label; if (lblClientid != null) { // do something if found the control... // e.g. assign the value to a variable var ClientId = lblClientid.Text; }返回-1，则需要检查存储过程并查看选项cmd.ExecuteNonQuery()是否开启/关闭。

有关详细信息，请查看https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery.aspx

Answer 2

您必须在参数中使用ClientId.Text，而不是ClientId。

Answer 3

我已经得到答案他们在阅读网格值时没有错，但错误就在附近

var check = true;

它应该是 var check =“true”;

感谢 woodykiddy 提供答案。

从对象类型System.Web.UI.WebControls.Label到已知的托管提供程序本机类型不存在映射

3 个答案: