在ap.net Web项目中一直使用Elmah进行日志记录，
但一直有一个问题困扰我很久，那就是我如何自己生成一个错误并记录到Elmah里去。
你知道有时你需要在项目中生成一个错误用于一些特殊的需求
最开始之前我是这样处理的。
使用Sql语句自定义错误信息添加到Elmah的Sqlite数据库中，但这样做有一个问题，
如果Elmah更改存储方式非Sqlite（如Xml，txt，Mysql等）那么下面的方式就无效啦（错误信息无法在Elmah中显示）
public class CustomErrorSqlite{ static string UrlDecodeUtf( string _val) { return HttpUtility .UrlDecode(_val, System.Text. Encoding .UTF8); } static string StrDecode(string str) { return UrlDecodeUtf(str).Replace("&", "＆").Replace("<br />", " ").Replace("<br>", " ").Replace("<", "<").Replace(">", ">").Replace("\"", """).Replace("\'", "'").Replace(")", ")").Replace("(", "(").Replace("{", "{").Replace("}", "}").Replace("/", "/"); } static string GetServerVariables { get { StringBuilder sb = new StringBuilder("<serverVariables>"); foreach (string str in HttpContext.Current.Request.ServerVariables) { sb.Append(string.Format("<item name='{0}'><value string='{1}'/></item>", str, StrDecode(HttpContext.Current.Request.ServerVariables[str]))); } sb.Append("</serverVariables>"); return sb.ToString(); } } /// <summary> /// 错误信息,错误地址,错误详细信息 /// AllXml列需要将@#等特殊字符进行处理，否则在查看Elmah详情时会出现 /// </summary> /// <param name="message">错误信息</param> /// <param name="source">错误来源</param> /// <param name="detailmessage">详细的错误信息</param> public static void AddLog(string message, string source, string detailmessage) { detailmessage = StrDecode(UrlDecodeUtf(detailmessage)); message = StrDecode(UrlDecodeUtf(message)); source = StrDecode(UrlDecodeUtf(source)); //使用Elmah的Sqlite数据库 //如果在配置文件中更改sqlite数据库位置或更改为其他存储方式 //下面的处理方式无效（数据无法在Elmah中显示和查看） string ConnectionString = string.Empty; foreach (ConnectionStringSettings str in ConfigurationManager.ConnectionStrings) { if (!str.Name.Contains("Elmah_SQLiteErrorLog")) continue; ConnectionString = str.ConnectionString; break; } using (SQLiteConnection sQLiteConnection = new SQLiteConnection(ConnectionString)) { using (SQLiteCommand sQLiteCommand = new SQLiteCommand("INSERT INTO Error (Application, Host, Type, Source, Message, User, StatusCode, TimeUtc, AllXml)VALUES (@Application, @Host, @Type, @Source, @Message, @User, @StatusCode, @TimeUtc, @AllXml);SELECT last_insert_rowid();", sQLiteConnection)) { SQLiteParameterCollection parameters = sQLiteCommand.Parameters; parameters.Add("@Application", DbType.String, 60).Value = "/"; parameters.Add("@Host", DbType.String, 30).Value = Environment.UserName; parameters.Add("@Type", DbType.String, 100).Value = "UserType"; parameters.Add("@Source", DbType.String, 60).Value = "UserType"; parameters.Add("@Message", DbType.String, 500).Value = message; parameters.Add("@User", DbType.String, 50).Value = Environment.UserName; parameters.Add("@StatusCode", DbType.Int64).Value = 300; parameters.Add("@TimeUtc", DbType.DateTime).Value = DateTime.Now; parameters.Add("@AllXml", DbType.String).Value = string.Format("<error type=\"UserType\" message=\"{0}\" source=\"{1}\" detail=\"\r\n{2}\r\nSource:{3} \">{4}</error>", message, source, detailmessage + "\r\ndatetime:" + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss:ms"), source, GetServerVariables); try { sQLiteConnection.Open(); sQLiteCommand.ExecuteScalar(); } catch (Exception) { } finally { sQLiteCommand.Clone(); } } } } }