1 public string SelectFileWpf()
 3             var openFileDialog = new Microsoft.Win32.OpenFileDialog()
 5                 Filter = "Text documents (.txt)|*.txt|All files (*.*)|*.*"
 6             };
 7             var result = openFileDialog.ShowDialog();
 8             if (result == true)
10                 return openFileDialog.FileName;
11             }
12             else
13             {
14                 return null;
15             }
 1.2选择文件夹
WPF提供了选择文件对话框，但并没有提供选择文件夹的对话框。
1.3另存为对话框
SaveFileDialog类位于PresentationFramework.dll 的Microsoft.Win32命名空间
public static string ChooseSaveFile(string title,string initFolder)
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Title = title;
            dlg.FileName = "User.txt"; // Default file name
            dlg.DefaultExt = ".txt"; // Default file extension
            dlg.Filter = "Text documents|*.txt"; // Filter files by extension
            dlg.InitialDirectory = initFolder;
            // Process save file dialog box results
            if (dlg.ShowDialog() == true)
                return dlg.FileName;
                return null;
二 WinForm
下面需要添加System.Windows.Forms.dll
2.1选择文件
1  public string SelectFile() //弹出一个选择文件的对话框
3             OpenFileDialog file = new OpenFileDialog();
4             file.ShowDialog();
5             return file.SafeFileName;
6         }
2.2选择文件夹
using System.Windows.Forms;

FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();
            if (folderBrowserDialog.ShowDialog() == DialogResult.OK)
                string outDir = folderBrowserDialog.SelectedPath;
https://docs.microsoft.com/zh-cn/dotnet/api/system.windows.forms.openfiledialog?view=netframework-4.7.2
C# 文件过滤器filter
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