C#实现把String字符串转化为SQL语句中的In后接的参数

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实现把String字符串转化为In后可用参数代码：

public string StringToList(string aa)
{
string bb1 = "(";
if (!string.IsNullOrEmpty(aa.Trim()))
{ string[] bb = aa.Split(new string[] { "\r\n", ",", ";", "* " }, StringSplitOptions.RemoveEmptyEntries);
for (int i = ; i < bb.Length; i++)
{
if (!bb1.Contains(bb[i]))//去掉重复的輸入值
{
bb1 += "'" + bb[i] + "',";
}
}
}
bb1 = bb1.Substring(, bb1.LastIndexOf(",")) + ")";
return bb1;
}