C# 获取指定文件的根信息

【实例截图】

【核心代码】

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Files
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.FolderBrowserDialog folderBrowserDialog1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.Button button4;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.button4 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 16);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(216, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "文件或文件夹全路径名： ";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(8, 40);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(320, 21);
			this.textBox1.TabIndex = 1;
			this.textBox1.Text = "C:\\Windows";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(8, 72);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(80, 23);
			this.button1.TabIndex = 2;
			this.button1.Text = "浏览文件夹";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(88, 72);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(80, 23);
			this.button2.TabIndex = 5;
			this.button2.Text = "浏览文件";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(168, 72);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(80, 24);
			this.button3.TabIndex = 6;
			this.button3.Text = "显示根信息";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(248, 72);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(80, 24);
			this.button4.TabIndex = 7;
			this.button4.Text = "父目录信息";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(336, 110);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "显示指定文件夹和文件路径的根信息";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//浏览文件夹
			if(this.folderBrowserDialog1.ShowDialog()==DialogResult.OK)
			{
				if(this.folderBrowserDialog1.SelectedPath.Trim()!="")
					this.textBox1.Text=this.folderBrowserDialog1.SelectedPath.Trim();
			}
		}

		private void button2_Click(object sender, System.EventArgs e)
		{//浏览文件
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				if(this.openFileDialog1.FileName.Trim()!="")
					this.textBox1.Text=this.openFileDialog1.FileName;
			}
		}

		private void button3_Click(object sender, System.EventArgs e)
		{//显示根信息
			if(this.textBox1.Text.Trim()=="")
				return;
			string MyRoot=System.IO.Directory.GetDirectoryRoot(this.textBox1.Text);
			MessageBox.Show("根是：" MyRoot,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);

		}

		private void button4_Click(object sender, System.EventArgs e)
		{//显示父目录信息
			if(this.textBox1.Text.Trim()=="")
				return;
			try
			{
				System.IO.DirectoryInfo MyInfo=System.IO.Directory.GetParent(this.textBox1.Text);			
				MessageBox.Show("父目录是：" MyInfo.FullName,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);		
			}
			catch(Exception Err)
			{
				MessageBox.Show("不要只选择根目录！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
	}
}