OpenFileDialog openFileDialog = new OpenFileDialog();

//打开的文件选择对话框上的标题

openFileDialog.Title = "请选择文件";

//设置文件类型

openFileDialog.Filter = "文本文件(*.txt)|*.txt|全部文件(*.*)|*.*";

//设置默认文件类型显示顺序

openFileDialog.FilterIndex = 1;

//保存对话框是否记忆上次打开的文件夹

openFileDialog.RestoreDirectory = true;

//设置是否同意多选

openFileDialog.Multiselect = false;

//按下确定选择的button

if (openFileDialog.ShowDialog() == DialogResult.OK)

{

	//获得文件路径

	string localFilePath = openFileDialog.FileName.ToString();

	//获取文件路径。不带文件名称

	//FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("\\"));

	//获取文件名称。带后缀名，不带路径

	string fileNameWithSuffix = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);

	//去除文件后缀名

	string fileNameWithoutSuffix = fileNameWithSuffix.Substring(0, fileNameWithSuffix.LastIndexOf("."));

	//在文件名称前加上时间

	string fileNameWithTime = DateTime.Now.ToString("yyyy-MM-dd ") + fileNameExt;

	//在文件名称里加字符

	string newFileName = localFilePath.Insert(1, "dameng");

}

本文固定链接：http://www.itechzero.com/c-sharp-openfiledialog-usage.html。转载请注明出处。