c#在打开文件对话框中有选择文件的数量限制吗?
本文关键字:文件 有选择 对话框 | 更新日期: 2023-09-27 18:16:08
我有一个c# windows窗体应用程序,我从打开文件浏览器加载XML文件和CGM图形文件到我的应用程序。我似乎可以一次选择几百个,它的工作没有故障,但任何更多和一个对话框弹出告诉我它找不到这样的文件,但只给出了一半的文件名。我假设这是由于可以通过打开文件对话框一次选择/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,有没有办法解决这个问题?
我正在有效地将文件"导入"到我的应用程序中,因此使用foreach循环将选定的文件移动到另一个文件夹,并且应用程序将导入文件的所有文件名(以及文件上的其他数据)写入XML文件。
下面是整个'import'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();
}
}
根据本文,当您使用OpenFileDialog
控件选择超过200
的文件时,您将收到" Too many files selected
"错误消息。
刚刚在。net 4.5中进行了测试,5000个文件没有问题,所以看起来它取决于。net框架/os版本(我已经使用了足够长的文件名,只是为了确定,它不依赖于一些旧的windows约束,如所有文件名的最大长度是65536或32768):
var directory = @"c:'test'test";
Directory.CreateDirectory(directory);
for (int i = 0; i < 5000; i++)
{
var path = Path.Combine(directory, i.ToString() + new string('a', 200));
File.WriteAllText(path, "");
}
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
var fileCount = openFileDialog1.FileNames;
var lastFileName = openFileDialog1.FileNames[4999];
}
在。net Framework 1.1中,对于OpenFileDialog。多选属性:
可以打开200个文件的硬编码限制打开文件对话框。有关此限制的详细信息,请参见第820631条"PRB: 'Too Many Files Selected'错误消息发生当你使用OpenFileDialog控件",在微软知识基地在http://support.microsoft.com.
当你必须处理这么多文件时,也许只选择文件夹更有意义(如果你选择文件夹中的所有文件更合理,如果这是你的情况)。尝试使用FolderBrowserDialog类:
var folderBrowserDialog = new FolderBrowserDialog();
if (folderBrowserDialog.ShowDialog() == DialogResult.OK)
{
var fi = new DirectoryInfo(folderBrowserDialog.SelectedPath);
// here you get the files collection
var files = fi.GetFiles();
}
尝试:
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
openFileDialog1.Multiselect = false;
var fileCount = openFileDialog1.FileNames;
var lastFileName = openFileDialog1.FileNames[4999];
}