一个.net程序防止sql注入的方法，方式一如下：将下面的代码加入到Global.asax文件中：
///<summary>
///防止SQL注入
///</summary>
///<param ></param>
///<param ></param>
void Application_BeginRequest(Object sender, EventArgs e)
{
StartProcessRequest();
}
#region SQL注入式攻击代码分析
///<summary>
///处理用户提交的请求
///</summary>
private void StartProcessRequest()
{
try
{
string getkeys = "";
string sqlErrorPage = "error.aspx";//转向的错误提示页面
if (System.Web.HttpContext.Current.Request.QueryString != null)
{
for (int i = 0; i < System.Web.HttpContext.Current.Request.QueryString.Count; i++)
{
getkeys = System.Web.HttpContext.Current.Request.QueryString.Keys[i];
if (!ProcessSqlStr(System.Web.HttpContext.Current.Request.QueryString[getkeys]))
{
System.Web.HttpContext.Current.Response.Redirect(sqlErrorPage);
System.Web.HttpContext.Current.Response.End();
}
}
}
if (System.Web.HttpContext.Current.Request.Form != null)
{
for (int i = 0; i < System.Web.HttpContext.Current.Request.Form.Count; i++)
{
getkeys = System.Web.HttpContext.Current.Request.Form.Keys[i];
if (getkeys == "__VIEWSTATE") continue;
if (!ProcessSqlStr(System.Web.HttpContext.Current.Request.Form[getkeys]))
{
System.Web.HttpContext.Current.Response.Redirect(sqlErrorPage);
System.Web.HttpContext.Current.Response.End();
}
}
}
}
catch
{
// 错误处理: 处理用户提交信息!
}
}
///<summary>
///分析用户请求是否正常
///</summary>
///<param >传入用户提交数据 </param>
///<returns>返回是否含有SQL注入式攻击代码 </returns>
private bool ProcessSqlStr(string Str)
{
bool ReturnValue = true;
try
{
if (Str.Trim() != "")
{
string SqlStr = "and .exec .insert .select .delete .update .count .* .chr .mid .master .truncate .char .declare";
string[] anySqlStr = SqlStr.Split('.');
foreach (string ss in anySqlStr)
{
if (Str.ToLower().IndexOf(ss) >= 0)
{
ReturnValue = false;
break;
}
}
}
}
catch
{
ReturnValue = false;
}
return ReturnValue;
}
#endregion
方法二如下：在App_Code文件夹中加一个类SqlZr.cs 其内容如下
public class SqlZr
{
public SqlZr()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static string DelSQLStr(string str)
{
if (str == null || str == "")
return "";
str = str.Replace(";", "");
str = str.Replace("'", "");
str = str.Replace("&", "");
str = str.Replace("%20", "");
str = str.Replace("--", "");
str = str.Replace("==", "");
str = str.Replace("<", "");
str = str.Replace(">", "");
str = str.Replace("%", "");
str = str.Replace("+", "");
str = str.Replace("-", "");
str = str.Replace("=", "");
str = str.Replace(",", "");
return str;
}
}
再将所有项目中的Request.QueryString["id"]改为：
SqlZr.DelSQLStr(Request.QueryString["id"])即可
