WPF选择文件、文件夹和另存为对话框

一 WPF

1.1 选择文件对话框

OpenFileDialog类存在于PresentationFramework.dll程序集。

public string SelectFileWpf()
        {
            var openFileDialog = new Microsoft.Win32.OpenFileDialog()
            {
                Filter = "Text documents (.txt)|*.txt|All files (*.*)|*.*"
            };
            var result = openFileDialog.ShowDialog();
            if (result == true)
            {
                return openFileDialog.FileName;
            }
            else
            {
                return null;
            }
        }

 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;
            }
            else
            {
                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
2         {
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;
            }

参考：

https://docs.microsoft.com/zh-cn/dotnet/api/system.windows.forms.openfiledialog?view=netframework-4.7.2

C# 文件过滤器filter