c#技巧

源码：http://pan.baidu.com/s/1gdvg7jd

1、选择文件框

  StreamReader reader;
            OpenFileDialog openFileDialog1 = new OpenFileDialog();

            openFileDialog1.InitialDirectory = "c:\\";
            openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                if(openFileDialog1.FileName!=null)
                {
                    reader = new StreamReader(File.OpenRead(openFileDialog1.FileName), System.Text.Encoding.Default);
                    string alldata=reader.ReadToEnd();

                  // byte[] tmp= Encoding.Convert(Encoding.Default, Encoding.GetEncoding("utf-8"), Encoding.Default.GetBytes(alldata));
                  // alldata= Encoding.Default.GetString(tmp); 
                    Debug.WriteLine(alldata);
                    richTextBox1.Text = alldata;
                    reader.Close();
                }
            }

2、定位指定文件

 ProcessStartInfo psi = new ProcessStartInfo("Explorer.exe");
            string file = @"c:\windows\notepad.exe";
            psi.Arguments = " /select," + file;
            Process.Start(psi);

3、加载图片和进制转换

 pictureBox1.Image = Bitmap.FromFile("d:/tmp.png");
            //十进制转二进制

            Console.WriteLine(Convert.ToString(69, 2));
            //十进制转八进制

            Console.WriteLine(Convert.ToString(69, 8));

            //十进制转十六进制

            Console.WriteLine(Convert.ToString(69, 16));
            //二进制转十进制

            Console.WriteLine(Convert.ToInt32("100111101", 2));
            //八进制转十进制

            Console.WriteLine(Convert.ToInt32("76", 8));
            //C# 16进制转换10进制
            Console.WriteLine(Convert.ToInt32("FF", 16));

4、获取进程列表

//获取进程
            this.listBox1.Items.Clear();
            foreach (System.Diagnostics.Process thisproc in System.Diagnostics.Process.GetProcesses())
            {
                this.listBox1.Items.Add(thisproc.ProcessName);
                if (thisproc.ProcessName.ToString() == "cmd")
                {
                    //关闭进程
                    thisproc.Kill();
                }
            }

5、调用api例子

 [DllImport("user32.dll")]
        public static extern int MessageBox(int hWnd, String text, String caption, uint type);

        private void button9_Click(object sender, EventArgs e)
        {
            MessageBox(0, "Welcome to cf!", "C#调用API例子", 0);
        }

6、程序退出

 this.Close();
Application.Exit();