C# winForm 窗体：TextBox中显示文件的绝对路径，按钮背景颜色,richTextBox读取文本文件...

private void btnOpen_Click(object sender, EventArgs e)

{

OpenFileDialog ofd = new OpenFileDialog();

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

{

txtPath.Text = ofd.FileName;

}

public Form1()

{

InitializeComponent();

SetColButton.BackColor = Color.Green;//指在窗体的构造函数添加，其中SetColButton是Button的name名称

}

private void btnOpen_Click(object sender, EventArgs e)

{

FileStream fs = new FileStream("F:\\file.txt", FileMode.Open, FileAccess.Read);

StreamReader streamreader = new StreamReader(fs);

streamreader.BaseStream.Seek(0,SeekOrigin.Begin);

this.rtb.Text = "";

string strLine = streamreader.ReadLine();

while(strLine!=null)

{

this.rtb.Text += strLine + "\n";

strLine = streamreader.ReadLine();

}

streamreader.Close();

}