无法捕获 gridview 异常

Question

我试图在更新网格视图时捕获异常。 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;

异常处理的代码是

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：UPDATE 语句与 FOREIGN KEY 约束“FK_Products_Suppliers”冲突。冲突发生在数据库“NORTHWIND”、表“dbo.Suppliers”、列“SupplierID”中。 该语句已终止。 它曾经工作过，但不是每次都工作。 而且我还收到 Asp.net Validation of viewstate MAC failed 错误。

Answer 1

异常发生在 UpdateProduct 中调用的存储过程中，因此永远不会到达/调用事件 RowUpdated，因此您无法在那里“捕获”该异常。