老生常谈，获取数据库服务器的相关信息。

/// <summary>

/// 获取网内的数据库服务器名称

/// </summary>

public class SqlLocator

{

[System.Runtime.InteropServices.DllImport("odbc32.dll")]

private static extern short SQLAllocHandle(short hType, IntPtr inputHandle, out IntPtr outputHandle);

[System.Runtime.InteropServices.DllImport("odbc32.dll")]

private static extern short SQLSetEnvAttr(IntPtr henv, int attribute, IntPtr valuePtr, int strLength);

[System.Runtime.InteropServices.DllImport("odbc32.dll")]

private static extern short SQLFreeHandle(short hType, IntPtr handle);

[System.Runtime.InteropServices.DllImport("odbc32.dll",CharSet= System.Runtime.InteropServices.CharSet.Ansi)]

private static extern short SQLBrowseConnect(IntPtr hconn, System.Text.StringBuilder inString,

short inStringLength, System.Text.StringBuilder outString, short outStringLength,

out short outLengthNeeded);

private const short SQL_HANDLE_ENV = 1;
private const short SQL_HANDLE_DBC = 2;
private const int SQL_ATTR_ODBC_VERSION = 200;
private const int SQL_OV_ODBC3 = 3;
private const short SQL_SUCCESS = 0;
private const short SQL_NEED_DATA = 99;
private const short DEFAULT_RESULT_SIZE = 1024;
private const string SQL_DRIVER_STR = "DRIVER=SQL SERVER";

private SqlLocator(){}

/// <summary>
/// 获取网内的数据库服务器名称，是一个字符串数组。
/// </summary>
/// <returns></returns>
public static string[] GetServers()
{
string list = string.Empty;
IntPtr henv = IntPtr.Zero;
IntPtr hconn = IntPtr.Zero;
System.Text.StringBuilder inString = new System.Text.StringBuilder(SQL_DRIVER_STR);
System.Text.StringBuilder outString = new System.Text.StringBuilder(DEFAULT_RESULT_SIZE);
short inStringLength = (short) inString.Length;
short lenNeeded = 0;
try
{
if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_ENV, henv, out henv))
{
if (SQL_SUCCESS == SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(IntPtr)SQL_OV_ODBC3,0))
{
if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_DBC, henv, out hconn))
{

if (SQL_NEED_DATA ==  SQLBrowseConnect(hconn, inString, inStringLength, outString,
DEFAULT_RESULT_SIZE, out lenNeeded))
{

if (DEFAULT_RESULT_SIZE < lenNeeded)
{
outString.Capacity = lenNeeded;
if (SQL_NEED_DATA != SQLBrowseConnect(hconn, inString, inStringLength, outString,
lenNeeded,out lenNeeded))
{
throw new ApplicationException("Unabled to aquire SQL Servers from ODBC driver.");
}
}
list = outString.ToString();
int start = list.IndexOf("{") + 1;
int len = list.IndexOf("}") - start;
if ((start > 0) && (len > 0))
{
list = list.Substring(start,len);
}
else
{
list = string.Empty;
}
}
}
}
}
}
catch
{
list = string.Empty;
}
finally
{
if (hconn != IntPtr.Zero)
{
SQLFreeHandle(SQL_HANDLE_DBC,hconn);

}
if (henv != IntPtr.Zero)
{
SQLFreeHandle(SQL_HANDLE_ENV,hconn);
}
}

string[] array = null;

if (list.Length > 0)

{
array = list.Split(',');
}

return array;

}

}