C# 是否有打开文件对话框中所选文件数量的限制

Question

我有一个 C# windows 窗体应用程序，我在其中从打开文件浏览器将 XML 文件和 CGM 图形文件加载到我的应用程序中。我似乎可以一次选择几百个并且它可以正常工作，但如果再选择更多，就会弹出一个对话框告诉我它找不到这样那样的文件，但只给出了一半的文件名。我假设这是由于在打开文件对话框中一次可以选择/处理的文件数量受到限制。

有人知道这个数字是多少吗？如果我一次选择的数量超过了这个限制，有没有办法绕过它？

我有效地将文件“导入”到我的应用程序中，从而使用 foreach 循环将所选文件移动到另一个文件夹，应用程序将导入文件的所有文件名写入 XML 文件(以及作为文件上的其他数据)。

下面是整个“导入”方法

private void addFilesToCSDBToolStripMenuItem_Click(object sender, EventArgs e)
{
    int DMsimported = 0;
    int graphicsImported = 0;

    if (projectName == "")
    {
        MessageBox.Show("Please open a project first", "DAWS");
        return;
    }

    DialogResult result = openFileDialog1.ShowDialog();
    if (result == DialogResult.OK)
    {
        MessageBox.Show("This process may take several minutes depending on the number of imports", "DAWS");
        Application.UseWaitCursor = true;

        foreach (string file in openFileDialog1.FileNames)
        {
            string fileName = Path.GetFileNameWithoutExtension(file); //Gets just the name from the file path
            string ext = Path.GetExtension(file.ToLower());

            if (ext != ".CGM" && ext != ".cgm")
            {
                    bool exists = xmlFileWriter.checkIfFIleExists(fileName + ext);

                    if (exists != true)
                    {
                        xmlFileWriter.writeDatatoXML(file);
                        File.Move(file, CSDBpath + projectName + "\\CheckedIN\\" + fileName + ext);
                        DMsimported = DMsimported + 1;
                    }
                    else
                    {
                        MessageBox.Show(fileName + " already exists in the CSDB. This file will be skipped.", "DAWS");
                    }  
                }
            else
            {
                if (File.Exists(CSDBpath + projectName + "\\Graphics\\" + fileName + ext))
                {
                    if (Properties.Settings.Default.OverwriteGraphics == true)
                    {
                        File.SetAttributes(CSDBpath + projectName + "\\Graphics\\" + fileName + ext, FileAttributes.Normal); // need this line in order to set the file attributes. Exception thrown otherwise when system tries to overwrite the file.
                        File.Delete(CSDBpath + projectName + "\\Graphics\\" + fileName + ext);
                        File.Copy(file, CSDBpath + projectName + "\\Graphics\\" + fileName  + ext); //need to give the option as to whether to delete the existing file or skipp.
                    }
                    else
                    {
                        MessageBox.Show(fileName + " already exists in the CSDB. This file will be skipped. To enable overwriting tick the checkbox in Preferences", "DAWS");
                    }
                }
                else
                {
                    File.Copy(file, CSDBpath + projectName + "\\Graphics\\" + fileName + ext);
                }

                graphicsImported = graphicsImported + 1;                            
            }   
        }

        Application.UseWaitCursor = false;

        buildAllListViews();
        copyCGMfilesToDirectories();

        if (DMsimported > 0)
        {
            MessageBox.Show(DMsimported.ToString() + " DM files successfully imported into the CSDB", "DAWS");
        }
        if (graphicsImported > 0)
        {
            MessageBox.Show(graphicsImported.ToString() + " graphic files successfully imported into the CSDB", "DAWS");
        }
        if (graphicsImported == 0 && DMsimported == 0)
        {
            MessageBox.Show("No files imported", "DAWS");
        }

        updateMainFilesList();  
    }  
}

Answer 1

根据这个article ，当您使用 OpenFileDialog 控件选择超过 200 个文件时，您将收到“选择的文件过多”错误消息。