ASP.NET(C#) 在使用存储过程时捕获异常（sql 数据库）

Question

代码如下...我尝试使用调试点显示：

Procedure or function 'usp_select_legal1_data' expects parameter '@tower', which was not supplied.

C#代码：

try {
    LegalView.ActiveViewIndex = 2;

    String tw2 = TextBox3.Text;
    SqlDataSource SqlDataSource2 = new SqlDataSource();
    SqlDataSource2.ID = "SqlDataSource2";
    this.Page.Controls.Add(SqlDataSource2);
    SqlDataSource2.ConnectionString = System.Configuration.ConfigurationManager
        .ConnectionStrings["constr"].ConnectionString;
    SqlDataSource2.SelectParameters.Add("@tower", tw2);
    SqlDataSource2.SelectCommand = "usp_select_legal1_data";

    GVCaseTowerWise.DataSource = SqlDataSource2;
    GVCaseTowerWise.DataBind();

    if (GVCaseTowerWise.Rows.Count == 0) {
        ScriptManager.RegisterClientScriptBlock(
            this,
            this.GetType(),
            "alertMessage",
            "alert('No cases for this tower exist in the database')",
            true);
    }
} catch (Exception ex) {
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(),
            "alertMessage", "alert('error while getting data')", true);
}

这是我的存储过程：

ALTER PROCEDURE [dbo].[usp_select_legal1_data]
    @tower nvarchar(50)
AS
BEGIN
    SET NOCOUNT ON;

    SELECT distinct
      [tower_to]
      ,[tower_from]
      ,[sy_no]
    FROM [dbo].[legal1]
    WHERE ((tower_to = @tower) or (tower_from = @tower))
END

Answer 1

改变

SqlDataSource2.SelectParameters.Add("@tower", tw2);

到

SqlDataSource2.SelectParameters.Add("tower", tw2);

Answer 2

问题出在@，因为参数名是tower。请参阅下面的 MSDN 文档 https://msdn.microsoft.com/en-us/library/f58z9c1a(v=vs.110).aspx

Answer 3

我找到了问题的答案。问题在于定义存储过程。它仍然将该过程视为文本命令。这是我用过的

SqlDataSource2.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;

现在可以正常使用了。

ASP.NET(C#) 在使用存储过程时捕获异常（sql 数据库）

ASP.NET(C#) catching exception while using stored procedure (sql database)

c#

sql-server

asp.net

stored-procedures