private void button1_Click(object sender, EventArgs e) {var f = new OpenFileDialog();//f.Multiselect = true; //多选if (f.ShowDialog() == DialogResult.OK) {String filepath = f.FileName;//G:\新建文件夹\新建文本文档.txtString filename = f.SafeFileName;//新建文本文档.txtthis.textBox1.Text = filename +"   "+filepath;}}//选取文件夹，并获得路径private void button2_Click(object sender, EventArgs e) {FolderBrowserDialog f = new FolderBrowserDialog();if (f.ShowDialog() == DialogResult.OK) {String DirPath = f.SelectedPath;this.textBox1.Text = DirPath;//G:\新建文件夹}

参考：

C#：打开 文件/文件夹选择框，选取，并获得路径名称_c#带有输入框的选取文件按钮,输入框中显示选取文件的路径-CSDN博客