Question

我有一个数据表（dt）和一个用于将数据导出到Excel的按钮。

我正在使用ClosedXML来完成工作。

但是，当我点击导出按钮时，我得到了第一个saveFileDialog，然后在我点击OK后，我得到了第二个saveFileDialog。在此之后，文件将正确导出。

所以，代码......

这是按钮导出操作的主要代码。我正在使用saveFileDIalog来允许用户选择保存文件目录。

private void exportarToolStripMenuItem_Click(object sender, EventArgs e)
    {
        if(saveFileDialog.ShowDialog() == DialogResult.OK)
        {
            FileInfo fileInfo = new FileInfo(saveFileDialog.FileName);
            SaveToExcel(dt, fileInfo);
        }
    }

然后，方法

public static void SaveToExcel(System.Data.DataTable dt, FileInfo outputFile)
    {
        XLWorkbook wb = new XLWorkbook();
        var worksheet = wb.Worksheets.Add(dt, "ResultTable");

        using (MemoryStream memoryStream = GetStream(wb))
        {
            File.WriteAllBytes(outputFile.FullName, memoryStream.ToArray());
        }
    }

和MemoryStream

public static MemoryStream GetStream(XLWorkbook excelWorkbook)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            excelWorkbook.SaveAs(stream, new SaveOptions { EvaluateFormulasBeforeSaving = false, GenerateCalculationChain = false, ValidatePackage = false,  });
            return stream;
        }
    }

请有人帮我看看为什么我得到2个saveFileDialog？

感谢。

Answer 1

我看到了一个问题;我添加了一些评论：

private void exportarToolStripMenuItem_Click(object sender, EventArgs e)
{
    string filename = saveFileDialog.FileName; // what is this for? I would remove it.
    if(saveFileDialog.ShowDialog() == DialogResult.OK)
    {
        // problem in the following line, explained below
        string path = Path.GetFullPath(filename);
        // you should be picking the saveFileDialog.FileName at this point  to get
        // the user selection, not the filename variable you got before;
        // moreover, the saveFileDialog.FileName is already a full path, no need to
        // call the Path.GetFullPath method
        FileInfo fileInfo = new FileInfo(path);
        SaveToExcel(dt, fileInfo);
    }
}

编辑：其他用户报告了其他问题＆＃39;评论（糟糕的MemoryStream管理）

C＃saveFileDialog打开两次

1 个答案: