如何使用 StreamWriter.WriteAsync 并捕获异常？

Question

我有简单的写文件功能。

public static void WriteFile(string filename, string text)
{
    StreamWriter file = new StreamWriter(filename);
    try
    {
        file.Write(text);
    }
    catch (System.UnauthorizedAccessException)
    {
        MessageBox.Show("You have no write permission in that folder.");
    }
    catch (System.Exception e)
    {
        MessageBox.Show(e.Message);
    }

    file.Close();
}

如何转换我的代码以使用 StreamWriter.WriteAsync 和 try-catch？

Answer 1

async public static void WriteFile(string filename, string text)
{
    StreamWriter file = null;
    try
    {
        file = new StreamWriter(filename);
        await file.WriteAsync(text);
    }
    catch (System.UnauthorizedAccessException)
    {
        MessageBox.Show("You have no write permission in that folder.");
    }
    catch (System.Exception e)
    {
        MessageBox.Show(e.Message);
    }
    finally
    {
        if (file != null) file.Close();
    }
}