我想使用保存文件对话框保存任何类型的文件... 我的要求是基于列表框的选择(它包含各种类型的文件,如.txt,.xls)我想使用保存文件对话框提供下载选项...如果用户选择.txt文件文件存储在文本中基于文件扩展名的格式我想存储文件...我希望将相同文件副本保存到特定位置的那些文件
pl z帮帮我
Dim digresult As DialogResult = MessageBox.Show("Do you want to download ? ", "View", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If digresult = Windows.Forms.DialogResult.Yes Then
downlddialog.Filter = "All files (*.*)|*.*"
downlddialog.Title = "Save a file"
downlddialog.RestoreDirectory = True
downlddialog.OverwritePrompt = True
downlddialog.ShowDialog()
Dim dr As String = downlddialog.FileName
答案 0 :(得分:0)
System.Windows.Forms.SaveFileDialog saveFileDialog1;
saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
DialogResult dr= saveFileDialog1.ShowDialog();
if (dr==DialogResult.OK)
{
string filename = saveFileDialog1.FileName;
//save file using stream.
}
您可以使用此代码,此代码在C#中而不是 MessageBox.Show 使用 System.Windows.Forms.SaveFileDialog
答案 1 :(得分:0)
这将完成这项工作......
filter属性是可选的 - 只是您希望用户保存特定的文件类型
VB:
// Displays a SaveFileDialog so the user can save the Image
SaveFileDialog ^ saveFileDialog1 = new SaveFileDialog();
saveFileDialog1->Filter =
"JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
saveFileDialog1->Title = "Save an Image File";
saveFileDialog1->ShowDialog();
// If the file name is not an empty string, open it for saving.
if(saveFileDialog1->FileName != "")
{
// Saves the Image through a FileStream created by
// the OpenFile method.
System::IO::FileStream ^ fs =
safe_cast<System::IO::FileStream*>(
saveFileDialog1->OpenFile());
// Saves the Image in the appropriate ImageFormat based on
// the file type selected in the dialog box.
// Note that the FilterIndex property is one based.
switch(saveFileDialog1->FilterIndex)
{
case 1 :
this->button2->Image->Save(fs,
System::Drawing::Imaging::ImageFormat::Jpeg);
break;
case 2 :
this->button2->Image->Save(fs,
System::Drawing::Imaging::ImageFormat::Bmp);
break;
case 3 :
this->button2->Image->Save(fs,
System::Drawing::Imaging::ImageFormat::Gif);
break;
}
fs->Close();
}
C#
// Displays a SaveFileDialog so the user can save the Image
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
saveFileDialog1.Title = "Save an Image File";
saveFileDialog1.ShowDialog();
// If the file name is not an empty string open it for saving.
if(saveFileDialog1.FileName != "")
{
// Saves the Image via a FileStream created by the OpenFile method.
System.IO.FileStream fs =
(System.IO.FileStream)saveFileDialog1.OpenFile();
// Saves the Image in the appropriate ImageFormat based upon the
// File type selected in the dialog box.
// NOTE that the FilterIndex property is one-based.
switch(saveFileDialog1.FilterIndex)
{
case 1 :
this.button2.Image.Save(fs,
System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case 2 :
this.button2.Image.Save(fs,
System.Drawing.Imaging.ImageFormat.Bmp);
break;
case 3 :
this.button2.Image.Save(fs,
System.Drawing.Imaging.ImageFormat.Gif);
break;
}
fs.Close();
}
答案 2 :(得分:0)
您可以提取文件扩展名,然后为特定文件扩展名提供适当的文件写入逻辑,请参阅下面的示例代码,
SaveFileDialog oSaveFileDialog = new SaveFileDialog();
oSaveFileDialog.Filter = "All files (*.*) | *.*";
if (oSaveFileDialog.ShowDialog() == DialogResult.OK)
{
string fileName = oSaveFileDialog.FileName;
string extesion = Path.GetExtension(fileName);
switch (extesion)
{
case ".txt"://do something here
break;
case ".xls"://do something here
break;
default://do something here
break;
}
}