Dapper.net Insert MSSQL Unicode garbled problem

1. Effect:

2, processing method:

 /// <summary>        ///Insert Single SQL/// </summary>        /// <typeparam name= "T" ></typeparam>        /// <param name= "SQL" ></param>        /// <param name= "param" ></param>        /// <param name= "connectionString" ></param>        /// <returns></returns>         Public Static intInsert<t> (stringSqlDynamicparam =NULL,stringConnectionString =NULL)whereT:class,New()        {            using(IDbConnection conn =OpenConnection (connectionString)) {                returnConn. Execute (SQL, (Object) param,NULL,NULL,NULL); }        }

   Public Static ReadOnly string @" Insert into Spreadapierrormsgs (id,controllername,actionname,message,soluway,createdate)                                                    values (@Id, @ Controllername, @ActionName, @Message, @SoluWay, @CreateDate)";

        /// <summary>        ///Insert Single SQL/// </summary>        /// <typeparam name= "T" ></typeparam>        /// <param name= "SQL" ></param>        /// <param name= "param" ></param>        /// <param name= "connectionString" ></param>        /// <returns></returns>         Public Static intInsert<t> (stringSqlDynamicparam =NULL,stringConnectionString =NULL)whereT:class,New()        {            using(IDbConnection conn =OpenConnection (connectionString)) {                returnConn. Execute (SQL, (Object) param,NULL,NULL,NULL); }        }

Ps:dapper Source:

 /// <summary>    ///This class represents a SQL string, it can be used if you need to denote your parameter are a Char vs VarChar vs Nvarc Har vs NChar/// </summary>    Sealed Partial classDbString:Reasonable.Spread.Dapper.SqlMapper.ICustomQueryParameter {/// <summary>        ///Create a new dbstring/// </summary>         PublicDbstring () {Length =-1; } /// <summary>        ///Ansi vs Unicode/// </summary>         Public BOOLIsansi {Get;Set; } /// <summary>        ///Fixed Length/// </summary>         Public BOOLIsfixedlength {Get;Set; } /// <summary>        ///Length of the string-1 for Max/// </summary>         Public intLength {Get;Set; } /// <summary>        ///The value of the string/// </summary>         Public stringValue {Get;Set; } /// <summary>        ///ADD the parameter to the command ... internal use only/// </summary>        /// <param name= "command" ></param>        /// <param name= "name" ></param>         Public voidAddparameter (IDbCommand command,stringname) {            if(isfixedlength && Length = =-1)            {                Throw NewInvalidOperationException ("If specifying Isfixedlength, a Length must also be specified"); }            varparam =command.            CreateParameter (); Param. ParameterName=name; Param. Value= (Object) Value??DBNull.Value; if(Length = =-1&& Value! =NULL&& Value.length <=4000) {param. Size=4000; }            Else{param. Size=Length; } param. DbType= Isansi? (isfixedlength?) DbType.AnsiStringFixedLength:DbType.AnsiString): (isfixedlength?DbType.StringFixedLength:DbType.String); Command.        Parameters.Add (param); }    }

Dapper.net Insert MSSQL Unicode garbled problem