访问 Int 变量时 SSIS 出现异常

Question

我正在尝试创建一个脚本来即时生成我需要的文件夹。

该脚本采用 FolderName 和 OrderID 变量来生成要创建的文件夹名称。我将它们添加到脚本的只读变量中。

FolderName 一切正常，只有当我尝试访问 OrderID 变量时，事情才会崩溃。我在下面收到讨厌的异常错误。

    public void Main()
    {
        //  Output File Expression
        //     "" + @[User::FolderName]+"\Folder_"+ (DT_WSTR,20) @[User::T1_ID]  +"\SalesOrderHeader_T1_"+ (DT_WSTR,20) @[User::T1_ID]+ ".txt"

        String folderName = (string)Dts.Variables["User::FolderName"].Value;
        String OrderIDStr = (string)Dts.Variables["User::OrderID"].Value;
        System.Windows.Forms.MessageBox.Show(OrderIDStr, "OrderID Var");

        folderName = string.Concat(folderName, "\Folder_");
        System.Windows.Forms.MessageBox.Show(folderName, "Folder Name");

        try
        {
            // Determine whether the directory exists.
            if (Directory.Exists(folderName))
            {
                Console.WriteLine("That path exists already.");
                System.Windows.Forms.MessageBox.Show("That path exists already.", "WARNING");
                return;
            }

            // Try to create the directory.
                DirectoryInfo di = Directory.CreateDirectory(folderName);
                Console.WriteLine("The directory was created successfully at {0}.", Directory.GetCreationTime(folderName));
        }
        catch (Exception e)
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
        finally { }
    }

我在包级别将值设置为 1，并将其转换为字符串，所以我不确定问题出在哪里。

文本在框中被截断，这里是所有内容：

at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at system.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke (Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()

Answer 1

尝试使用 .ToString() 方法而不是转换 (string)

String OrderIDStr = Dts.Variables["User::OrderID"].Value.ToString();

基于此 article，不允许从 int 显式转换为 string。

参考资料

Casting to string versus calling ToString
Explicit numeric conversions table (C# Reference)
Casting and type conversions (C# Programming Guide)

访问 Int 变量时 SSIS 出现异常

SSIS Getting Exception When Accessing Int Variable

c#

sql-server

ssis

etl

script-task