C#语法功能结构

1、File
打开指定文件夹或者文件，“\”为转义字符
System.Diagnostics.Process.Start(Application.StartupPath + "\\Document\\资源管理器\\");

复制文件到指定目录下

ToolStripItem Strip = sender as ToolStripItem;
 string stripValue = Strip.Text.ToString();
 switch (stripValue)
 {
  case "自定义":
   OpenFileDialog h_OpenFile = new OpenFileDialog();
   h_OpenFile.Filter = "png文件|*.png";
   h_OpenFile.InitialDirectory = "E:\\";
   if (h_OpenFile.ShowDialog() == DialogResult.OK)
   {
      h_OpenFile.RestoreDirectory = true;
      var pathBefore = h_OpenFile.FileName.Substring(h_OpenFile.FileName.LastIndexOf("\\") + 1);
      var fileName = pathBefore.Substring(0, pathBefore.LastIndexOf("."));
      contextMenuStrip1.Items.Add(fileName).Click += ToolStripMenuItem_Click;

FileInfo fileInfo = new FileInfo(h_OpenFile.FileName);
      string appPath = Application.StartupPath + "\\Images\\Theme\\";
      try
      {
         File.Copy(h_OpenFile.FileName, appPath + fileInfo.Name);
      }
      catch (Exception ex)
      {
         MessageBox.Show("文件已经存在！");
      }
      finally
      {
         h_OpenFile.Dispose();
      }
   }
 break;
 default:
  try
  {
     this.BackgroundImage = Image.FromFile(Application.StartupPath + "\\Images\\Theme\\" + stripValue + ".png");
  }
  catch (Exception ex)
  {
     MessageBox.Show("背景不存在");
     this.contextMenuStrip1.Items.Remove(Strip);
  }
 break;
}

读取指定路径下的文件夹并且遍历目录下的文件
string strPath = string.Format(Application.StartupPath + "\\Document\\资源管理器\\5、报表模板\\");
DirectoryInfo directoryName = new DirectoryInfo(strPath);
foreach (FileInfo NextFile in directoryName.GetFiles())
{
     listViewEx1.Items.Add(NextFile.ToString(), 0);
}

判断该文件夹是否存在，否则创建
string strDirectory = Application.StartupPath + "\\Document\\系统工作文档\\2、分析报告\\谈话情况分析报告\\";
if (!Directory.Exists(strDirectory))
{
     MessageBox.Show("该目录不存在，新建文件夹");
     Directory.CreateDirectory(strDirectory);
}
判断该文件是否存在，否则就创建
string strFile = Application.StartupPath + "\\Document\\系统工作文档\\2、分析报告\\谈话情况分析报告\\报表.xls";
if (!File.Exists(strFile))
{
     MessageBox.Show("文件不存在，新建文件");
     File.Create(strFile);
}

向txt文件插入内容
StreamWriter myStream;
SaveFileDialog openFile = new SaveFileDialog();
openFile.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
openFile.FilterIndex = ;
openFile.RestoreDirectory = true;
if (openFile.ShowDialog() == DialogResult.OK)
{
    myStream = new StreamWriter(openFile.FileName);
    myStream.Write(textBox1.Text); //写入
    myStream.Close();//关闭流
}

2、PictureBox
设置PictureBox背景图片为DeBug目录下的文件图片 
pictureBox.BackgroundImage = Image.FromFile(Application.StartupPath + "\\Images\\弹窗类别\\" + "工作模版2.png");

3、ListView
获取listview选中项的首项
listView.FocusedItem.SubItems[].Text;
鼠标拖拽实现

//窗体允许拖拽
  this.AllowDrop = true;
  //listview允许拖拽
  this.listViewEx1.AllowDrop = true;
  //订阅项拖拽事件
  this.listViewEx1.ItemDrag += listViewEx1_ItemDrag;
  //订阅拖入项事件
  this.listViewEx1.DragEnter += listViewEx1_DragEnter;

4、String
"Jackie"+"Aillo"和String.Format("{0}{1}","Jackie", "Aillo")

5、Point
获取控件相对父元素的坐标
 if (this.Width-< e.X&&e.X<this.Width&&e.Y>panel2.Top&&e.Y<panel2.Top+panel2.Height)
 {
    panel2.Visible = true;
 }
 if (this.Height -  < e.Y && e.Y < this.Height&&e.X>this.Width-panel2.Width&&e.X<this.Width)
 {
    this.panel2.Visible = false;
 }

6、MessageBox
判断用户是否点击确定按钮
if(DialogResult.OK == MessageBox.Show("确定删除吗？", "提示", MessageBoxButtons.OKCancel))
{}