无法捕获 gridview 异常

Question

我试图在更新 gridview 时捕获异常。代码是

public static int UpdateProduct(
                             int productID,
                             string productName,
                             int supplierID,
                             int categoryID,
                             string quantityPerUnit,
                             decimal unitPrice,
                             int unitsInStock,
                             int unitsOnOrder,
                             int reorderLevel,
                             bool discontinued)
    {
        int rowsAffected = 0;

        using (SqlConnection connection = ConnectionManager.GetNorthwindConnection())
        {
              SqlCommand command = new SqlCommand("ttUpdateProduct", connection);
                command.CommandType = CommandType.StoredProcedure;

                command.Parameters.Add("@ProductID", SqlDbType.Int).Value = productID;
                command.Parameters.Add("@ProductName", SqlDbType.NVarChar, 40).Value = productName;
                command.Parameters.Add("@SupplierID", SqlDbType.Int).Value = supplierID;
                command.Parameters.Add("@CategoryID", SqlDbType.Int).Value = categoryID;
                command.Parameters.Add("@QuantityPerUnit", SqlDbType.NVarChar, 20).Value = quantityPerUnit;
                command.Parameters.Add("@UnitPrice", SqlDbType.Money).Value = unitPrice;
                command.Parameters.Add("@UnitsInStock", SqlDbType.SmallInt).Value = unitsInStock;
                command.Parameters.Add("@UnitsOnOrder", SqlDbType.SmallInt).Value = unitsOnOrder;
                command.Parameters.Add("@ReorderLevel", SqlDbType.SmallInt).Value = reorderLevel;
                command.Parameters.Add("@Discontinued", SqlDbType.Bit).Value = discontinued;

                rowsAffected = command.ExecuteNonQuery();



        }
        return rowsAffected;
    using (SqlConnection connection = ConnectionManager.GetNorthwindConnection())
        {
              SqlCommand command = new SqlCommand("ttUpdateProduct", connection);
                command.CommandType = CommandType.StoredProcedure;

                command.Parameters.Add("@ProductID", SqlDbType.Int).Value = productID;
                command.Parameters.Add("@ProductName", SqlDbType.NVarChar, 40).Value = productName;
                command.Parameters.Add("@SupplierID", SqlDbType.Int).Value = supplierID;
                command.Parameters.Add("@CategoryID", SqlDbType.Int).Value = categoryID;
                command.Parameters.Add("@QuantityPerUnit", SqlDbType.NVarChar, 20).Value = quantityPerUnit;
                command.Parameters.Add("@UnitPrice", SqlDbType.Money).Value = unitPrice;
                command.Parameters.Add("@UnitsInStock", SqlDbType.SmallInt).Value = unitsInStock;
                command.Parameters.Add("@UnitsOnOrder", SqlDbType.SmallInt).Value = unitsOnOrder;
                command.Parameters.Add("@ReorderLevel", SqlDbType.SmallInt).Value = reorderLevel;
                command.Parameters.Add("@Discontinued", SqlDbType.Bit).Value = discontinued;

                rowsAffected = command.ExecuteNonQuery();



        }
        return rowsAffected;

异常处理代码为

protected void ProductGridView_RowUpdated(object sender, GridViewUpdatedEventArgs e)
{
    if (e.Exception != null)
    {
        Master.ErrorMessage = "Cannot Update Record";
        e.ExceptionHandled = true;
    }
    else
    {
        Master.ResultMessage = "Record Updated Succesfully";
    }

但我仍然收到错误消息：UPDATE 语句与 FOREIGN KEY 约束冲突 "FK_Products_Suppliers"。冲突发生在数据库 "NORTHWIND"、table "dbo.Suppliers"、列 'SupplierID' 中。该语句已终止。它曾经工作过一次，但不是每次都工作。而且我也收到 Asp.net 视图状态验证 MAC 失败错误。

Answer 1

在 UpdateProduct 中调用的存储过程中发生了异常，因此事件 RowUpdated 永远不会 reached/called 因此您不能 "catch" 那个异常。

无法捕获 gridview 异常

Not able to catch gridview exception

c#

database

asp.net

gridview