OpenFileDialog 选择所需的文件类型代码

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string resultFile = "";

OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "D:\\Patch";
openFileDialog1.Filter = "All files (*.*)|*.*|txt files (*.txt)|*.txt";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
resultFile = openFileDialog1.FileName;

resultFile 就能得到你选中文件的路径

OpenFileDialog控件有以下基本属性

InitialDirectory	对话框的初始目录
Filter	要在对话框中显示的文件筛选器，例如，"文本文件(*.txt)|*.txt|所有文件(*.*)||*.*"
FilterIndex	在对话框中选择的文件筛选器的索引，如果选第一项就设为1
RestoreDirectory	控制对话框在关闭之前是否恢复当前目录
FileName	第一个在对话框中显示的文件或最后一个选取的文件
Title	将显示在对话框标题栏中的字符
AddExtension	是否自动添加默认扩展名
CheckPathExists	在对话框返回之前，检查指定路径是否存在
DefaultExt	默认扩展名
DereferenceLinks	在从对话框返回前是否取消引用快捷方式
ShowHelp	启用"帮助"按钮
ValiDateNames	控制对话框检查文件名中是否不含有无效的字符或序列