AJAX下客戶端調用服務端頁面方法

1.客戶端代碼如下：

//函數功能：客戶端調用頁面服務端方法

//示例：

//參數說明：

//isStaticMethod：是否是靜態方法

//methodName：方法名稱

//methodParamter：[可選]方法參數，必須是類型MethodParamter的實例或者null值（無參數）
//callBackMethod：[可選]方法調用完后回調的客戶端方法，客戶端方法形式為 function callBackMethod(result){}，result是個json對象，例如：function HandleCheckListResult(result){}，參數值就是'HandleCheckListResult'
//assemblyAndClassName：[可選]頁面服務端所在組件和類名，形式為： 'AssemblyName|ClassFullName'，例如： Weiky.dll|Weiky.AccessoriesForm'
function CallPageMethod(isStaticMethod,methodName,methodParamter,callBackMethod,assemblyAndClassName)
...{
if(methodParamter && typeof(methodParamter.AddBoolParamter) != 'function')
...{
alert(“參數methodParamter必須是類型MethodParamter的實例或者null值");
return;
}
if(assemblyAndClassName == null)
...{
if(typeof(AssemblyAndClassName) != 'undefined')
...{
assemblyAndClassName = AssemblyAndClassName;
}
else
...{
alert("未提供頁面服務端所在組件和類名");
return;
}
}
try
...{
MyWebService.CallPageMethod(assemblyAndClassName,isStaticMethod,methodName,methodParamter?methodParamter.ToJson():null,methodParamter.ToType(),callBackMethod?callBackMethod:'', CallBackByWebService,HandleServiceMethodCallError);
}
catch(err)
...{
alert('將參數轉換成JSON對象失敗！');
}
}

function CallBackByWebService(result)
...{
var json = ConvertStringToJson(result);
if(json.Type != 0)
...{
ShowMessageBox2(json);
}
else
...{
var callBackMethod = json.HighlevelMessage;
if(callBackMethod != '')
...{
json.HighlevelMessage = '';
json.Message = ReplaceString(json.Message,'┍',' ');
eval(callBackMethod + '(json)');
}
}
}

function MethodParamter()
...{
var paramter = '';
var json = null;

this.AddStringParamter = function (value)
...{
AddParamter('string',ReplaceString(ReplaceString(value,'"','"'),' ','┍'));
}

this.AddGuidParamter = function (value)
...{
AddParamter('guid',value);
}

this.AddDateParamter = function (value)
...{
AddParamter('date',value);
}

this.AddIntParamter = function (value)
...{
AddParamter('int',value);
}

this.AddDecimalParamter = function (value)
...{
AddParamter('decimal',value);
}

this.AddBoolParamter = function (value)
...{
AddParamter('bool',value);
}

function AddParamter(type,value)
...{
if(paramter != '')
...{
paramter += ','
}
paramter += '{"Type":"' + type + '","Value":"' + value + '"}';
}

this.AddJsonParamter = function (p)
...{
json = p;
}

this.ToJson = function ()
...{
if(json)
...{
return json;
}
if(paramter != '')
...{
return eval('[' + paramter + ']');
}

return null;
}

this.ToType = function ()
...{
return json?1:0;
}
}
2.服務端webservice提供給ScriptManager控件，webservice代碼如下：

[System.Web.Script.Services.ScriptService]
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class MyWebService : System.Web.Services.WebService
...{
[WebMethod(EnableSession = true)]
public string CallPageMethod(string assemblyAndClassName, bool isStaticMethod, string methodName, object paramtersPackage,int mpType,string callBackMethod)
...{
try
...{
object result = "";
bool succeed = false;
if (isStaticMethod)
...{
Type type = GetActualType(assemblyAndClassName);
if (type != null)
...{
succeed = true;
if (mpType == 1)
...{
result = type.InvokeMember(methodName, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Static, null, null, new object[] ...{ paramtersPackage });
}
else
...{
result = type.InvokeMember(methodName, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Static, null, null, GetMethodArgs(paramtersPackage));
}
}
}
else
...{
object o = WebBase.GetActualInstance(assemblyAndClassName, this.Server.MapPath("~/bin/"));
if (o != null)
...{
succeed = true;
if (mpType == 1)
...{
result = o.GetType().InvokeMember(methodName, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Instance, null, o, new object[] ...{ paramtersPackage });
}
else
...{
result = o.GetType().InvokeMember(methodName, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Instance, null, o, GetMethodArgs(paramtersPackage));
}
}
}

return succeed ? 0 : 1, succeed ? (result == null ? "" : result.ToString()) : string.Format("獲取組件信息失敗，請檢查組件參數{0}是否正確", assemblyAndClassName);
}
catch (Exception err)
...{
return err.Message;
}
}
private object[] GetMethodArgs(object paramtersPackage)
...{
if (paramtersPackage == null) return null;

int i = 0;
object[] args = new object[((object[])paramtersPackage).Length];
foreach (System.Collections.Generic.Dictionary<string, object> p in (object[])paramtersPackage)
...{
switch (p["Type"].ToString().ToLower())
...{
case "string":
args[i++] = p["Value"].ToString().Replace("┍"," ");
break;
case "guid":
args[i++] = new Guid(p["Value"].ToString());
break;
case "date":
args[i++] = Convert.ToDateTime(p["Value"].ToString());
break;
case "int":
args[i++] = Convert.ToInt32(p["Value"].ToString());
break;
case "decimal":
args[i++] = Convert.ToDecimal(p["Value"].ToString());
break;
case "bool":
args[i++] = Convert.ToBoolean(p["Value"].ToString());
break;
default:
args[i++] = p["Value"];
break;
}
}
return args;
}
private WebBaseForm GetActualInstanceForm(string assemblyAndClassName)
...{
object o = WebBase.GetActualInstance(assemblyAndClassName,this.Server.MapPath("~/bin/"));
if (o != null)
...{
if (o is WebBaseForm)
...{
return (WebBaseForm)o;
}
}

return null;
}

private Type GetActualType(string assemblyAndClassName)
...{
if (assemblyAndClassName != "")
...{
string[] ac = assemblyAndClassName.Replace("!", "").Split('|');
if (ac.Length == 2)
...{
ac[0] = WebBase.AddPath(ac[0],this.Server.MapPath("~/bin/"));
return System.Reflection.Assembly.LoadFrom(ac[0]).GetType(ac[1]);
}
}

return null;
}
}
3.客戶端調用示例：

function DataDDL_Change(ddl)
...{
var mp = new MethodParamter();
mp.AddIntParamter(DropDownList_GetValue(ddl));
mp.AddIntParamter(EntityObjectId);
CallPageMethod(true,'GetEntityData',mp,'LoadDataTree');
}

function LoadDataTree(json)
...{
alert(json.Message);
}
總結：通過這樣的封裝，客戶端調用服務端靜態/實例方法非常方便，并且不會引起任何頁面的postback。上面所用客戶端技術有ajax,json等

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/weiky626/archive/2007/07/14/1690378.aspx

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