Frontend calls background Functions

Call var B = $ Ajax ("webapplication1. _ default. getdataset", ["23"]);

JS:/* full name of the method, parameter, and assembly name of the class (when the namespace of the method class is not the Assembly name, please pass the parameter )*/
Function $ Ajax (parammethod, paramvalue, paramassemblyname ){
If (! Parammethod) {dialog. Alert ("method parameters with full names missing", 1 );}
VaR result, Params = "", assemblyname, classname, methodname;
If (paramvalue) for (VAR I = 0; I <paramvalue. length; I ++) {Params + = "& Param" + I + "=" + encodeuri (paramvalue [I]) ;}; // get the Parameter
Classname = parammethod. substring (0, parammethod. lastindexof ('.'); // obtain the Class Name of the Method
Methodname = parammethod. substring (parammethod. lastindexof ('.') + 1); // obtain the method name
Assemblyname = classname. substring (0, classname. lastindexof ('.'); If (paramassemblyname) assemblyname = paramassemblyname; // obtain the namespace name
$. Ajax ({URL: "/../ajax. ashx? Assembly = "+ assemblyname +" & Class = "+ classname +" & method = "+ methodname + Params, type:" Post ", async: false,
Success: function (data) {result = eval ("(" + Data + ")");},
Error: function (data ){
Layer. MSG (data. responsetext, 2, 0 );
}
});
Return result;
}

Ajax. ashx:

Using system; using system. collections. generic; using system. web; using system. web. sessionstate; using system. data; using system. reflection; using system. io; using system. web. script. serialization;

Namespace chengrui. RSP. uilayer {// <summary> // Ajax summary /// </Summary> public class Ajax: ihttphandler, irequiressessionstate {

# Region Public void getmethod () get parameters /// <summary> /// get parameters /// </Summary> /// <Param name = "context"> interface content </param> /// <Param name = "paramfield"> parameter </param> // <returns> </returns> Public String getrequest (httpcontext context, string paramfield) {try {return context. request [paramfield] = NULL | context. request [paramfield]. tostring () = "undefined "? "": Context. request [paramfield]. tostring (). Trim () ;}catch {return string. Empty ;}# endregion

Public void processrequest (httpcontext context) {object result = NULL; try {string assemblyname = This. getrequest (context, "assembly"), classname = This. getrequest (context, "class"), methodname = This. getrequest (context, "method"); // obtain the assembly type = NULL; try {Assembly myassembly = assembly. load (assemblyname); type = myassembly. getType (classname);} catch {type = assembly. getexecutingassembly (). getType (classname );}

// If the Assembly cannot be found, all the contents in the base Directory are traversed using chengrui. rs. while obtaining method if (type = NULL) {fileinfo [] arrfileinfo = new directoryinfo (appdomain. currentdomain. relativesearchpath ). getfiles ("chengrui. rs. *. DLL "); foreach (fileinfo myfile in arrfileinfo) {type = assembly. load (myfile. name. substring (0, myfile. name. lastindexof ('. '))). getType (classname); If (type! = NULL) break ;}}

If (type! = NULL) {system. reflection. methodinfo = type. getmethod (methodname); If (methodinfo! = NULL) // determines whether the operation page has this method {object [] ARGs = new object [methodinfo. getparameters (). length]; // assign a value for the parameter of the other method name (INT I = 0; I <methodinfo. getparameters (). length; I ++) {ARGs [I] = convert. changetype (this. getrequest (context, "Param" + I. tostring (), methodinfo. getparameters () [I]. parametertype);} // execution method result = methodinfo. invoke (activator. createinstance (type), argS);} else result = "[assemblyname:" + assemblyname + "]. [classname: "+ classname + "]. [methodname: "+ methodname +"] method ";} else result =" [assemblyname: "+ assemblyname +"] Not found "]. [classname: "+ classname +"] class ";} catch (exception myex) {result = myex. message;} // context. response. write (commonmethod. tojson (result); context. response. write (tojson (result ));}

Public bool isreusable {get {return false ;}}

# Region Public static string tojson (Object OBJ) /// <summary> /// convert to JSON /// </Summary> /// <Param name = "OBJ"> </param> /// <returns> </returns> Public static string tojson (Object OBJ) {If (OBJ = NULL) OBJ = string. empty; javascriptserializer myjson = new javascriptserializer (); If (obj. getType (). name = "datatable") {datatable mydt = (datatable) OBJ; string tablename = mydt. tablename = ""? "Tablename1": mydt. tablename; dictionary <string, Object> DIC = new dictionary <string, Object> (); dic. add (tablename, rowstodictionary (mydt); Return myjson. serialize (DIC);} else if (obj. getType (). name = "dataset") {dataset myds = (Dataset) OBJ; dictionary <string, Object> DIC = new dictionary <string, Object> (); for (INT I = 0; I <myds. tables. count; I ++) {string tablename = myds. tables [I]. tablen Ame = ""? "Tablename" + I. tostring (): myds. tables [I]. tablename; dic. add (tablename, rowstodictionary (myds. tables [I]);} return myjson. serialize (DIC);} else return myjson. serialize (OBJ );}

Private Static list <dictionary <string, Object> rowstodictionary (datatable table) {list <dictionary <string, Object> objs = new list <dictionary <string, object >>> (); foreach (datarow DR in table. rows) {dictionary <string, Object> Drow = new dictionary <string, Object> (); For (INT I = 0; I <table. columns. count; I ++) {Drow. add (table. columns [I]. columnname, Dr [I]);} objs. add (Drow);} return objs ;}

# Endregion }}