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Ò»¡¢Ê×ÏÈÏÈÌí¼ÓÒýÓà   using Microsoft.Win32;     
//ÒòΪ²Ù×÷×¢²á±íµÄÁ½¸öÀàRegistryKeyºÍRegistry¶¼°üº¬ÔÚ´ËÒýÓÃÖУ»
 
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1¡¢ #region      ÏÞÖÆÈí¼þµÄʹÓôÎÊý
        private void BtnTimes_Click(object sender, EventArgs e)
        {
            try
            {
                 //ÔÚ×¢²á±íÖд´½¨×Ó¼ü
                RegistryKey rk = Registry.LocalMachine.CreateSubKey("SOFTWARE\\Microsoft\\Windows\\Currentversion\\Run\\nums"); //CreateSubKey´ò¿ªºÍ´´½¨Á½ÖÖ¹¦ÄÜ
                int numscount = (int)rk.GetValue("nums", 0);        //¶Áȡע²á±íÖÐÈí¼þʹÓôÎÊý
                if (numscount >= 10£©
                {
                    MessageBox.Show("²»ºÃÒâ˼£¬ÄãÊÇ·Ç×¢²áÓû§£¬Ö»ÄÜÃâ·ÑʹÓÃÊ®´Î£¬Çë×¢²á£¡", "ϵͳÌáʾ", MessageBoxButtons.OK,MessageBoxIcon.Warning);
                    rk.Close();       //¹Ø±Õ×¢²á±í
                    this.Close();    //Í˳ö³ÌÐò
                }
 &n


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XmlDocument doc = new XmlDocument();
XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "GB2312", null);
doc.AppendChild(dec);
//´´½¨Ò»¸ö¸ù½Úµã£¨Ò»¼¶£©
XmlElement root = doc.CreateElement("First");
doc.AppendChild(root);
//´´½¨½Úµã£ ......

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¡¡¡¡DllImportËùÔÚµÄÃû×Ö¿Õ¼ä using System.Runt ......

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// Õâ¸ö½á¹¹Ì彫»á´«µÝ¸øAPI¡£Ê¹ÓÃStructLayout
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal struct TokPriv1Luid
{
public int Count;
public ......

ArcEngine ͼÀýC#Ô´Âë:

private void MakeLegend(IActiveView activeView,IPageLayout pageLayout)
      {
          //¶¨ÒåͼÀýUID¶ÔÏó
          UID uid = new UIDClass();
      &n ......

C# »Ø¹ö

 private void save_db(){
    SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings[""].ToString());
    SqlCommand comm = new SqlCommand();
    conn.Open();
    SqlTransaction rollbk2= conn.BeginTransaction();
& ......
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