一、如何用AJAX調(diào)用JsonResult方法
比如FuckController中添加有個返回JsonResult類型的方法FuckJson()：
復(fù)制代碼 代碼如下:
span class="kwd">publicspan class="pln"> span class="typ">JsonResultspan class="pln"> span class="typ">FuckJsonspan class="pun">()span class="pln">
span class="pun">{span class="pln">
span class="kwd">returnspan class="pln"> span class="kwd">newspan class="pln"> span class="typ">JsonResultspan class="pun">()span class="pln">
span class="pun">{span class="pln">
span class="typ">Dataspan class="pln"> span class="pun">=span class="pln"> span class="kwd">newspan class="pln"> span class="typ">Listspan class="str">string>span class="pun">()span class="pln"> span class="pun">{span class="pln"> span class="str">"fuck"span class="pun">,span class="pln"> span class="str">"shit"span class="pln"> span class="pun">},span class="pln"> span class="typ">JsonRequestBehaviorspan class="pln"> span class="pun">=span class="pln"> span class="typ">JsonRequestBehaviorspan class="pun">.span class="typ">AllowGetspan class="pln">
span class="pun">};span class="pln">
span class="pun">}/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>
如果我們直接在瀏覽器里調(diào)用，是可以看到結(jié)果的：
因為在瀏覽器地址欄直接輸入這個地址，是一次GET請求，這就是為毛上面的代碼里要寫JsonRequestBehavior.AllowGet。
用JQuery AJAX調(diào)用的代碼如下：
復(fù)制代碼 代碼如下:
span class="pln">$span class="pun">.span class="pln">ajaxspan class="pun">({span class="pln">
urlspan class="pun">:span class="pln"> span class="str">"/Fuck/FuckJson"span class="pun">,span class="pln">
dataspan class="pun">:span class="pln"> span class="str">""span class="pun">,span class="pln">
dataTypespan class="pun">:span class="pln"> span class="str">"json"span class="pun">,span class="pln">
typespan class="pun">:span class="pln"> span class="str">"POST"span class="pun">,span class="pln">
contentTypespan class="pun">:span class="pln"> span class="str">"application/json; charset=utf-8"span class="pun">,span class="pln">
dataFilterspan class="pun">:span class="pln"> span class="kwd">functionspan class="pln"> span class="pun">(span class="pln">dataspan class="pun">)span class="pln"> span class="pun">{span class="pln">
span class="kwd">returnspan class="pln"> dataspan class="pun">;span class="pln">
span class="pun">},span class="pln">
successspan class="pun">:span class="pln"> span class="kwd">functionspan class="pln"> span class="pun">(span class="pln">dataspan class="pun">)span class="pln"> span class="pun">{span class="pln">
alertspan class="pun">(span class="pln">dataspan class="pun">);span class="pln">
span class="pun">}span class="pln">
span class="pun">})/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>
url: "/Fuck/FuckJson" 很顯然是Action的位置。data: "" 表示FuckJson()放方?jīng)]有參數(shù)。dataType: "json"是理所當(dāng)然的，我們返回的就是JsonResult。
二、返回自定義錯誤消息
默認情況下，如果AJAX請求發(fā)生了錯誤。它最多只知道錯誤碼，而無法顯示具體的錯誤信息。但報錯通常是需要的，所以我們先要寫一個過濾器，作用是一旦發(fā)生exception，就給返回的json中的data屬性加一個errorMessage。并且，response的狀態(tài)不能是200，不然ajax請求會以為沒有發(fā)生錯誤。一般的服務(wù)器端錯誤代碼是500。這個過濾器函數(shù)如下：
復(fù)制代碼 代碼如下:
span class="kwd">publicspan class="pln"> span class="kwd">classspan class="pln"> span class="typ">JsonExceptionFilterAttributespan class="pln"> span class="pun">:span class="pln"> span class="typ">FilterAttributespan class="pun">,span class="pln"> span class="typ">IExceptionFilterspan class="pln">
span class="pun">{span class="pln">
span class="kwd">publicspan class="pln"> span class="kwd">voidspan class="pln"> span class="typ">OnExceptionspan class="pun">(span class="typ">ExceptionContextspan class="pln"> filterContextspan class="pun">)span class="pln">
span class="pun">{span class="pln">
span class="kwd">ifspan class="pln"> span class="pun">(span class="pln">filterContextspan class="pun">.span class="typ">RequestContextspan class="pun">.span class="typ">HttpContextspan class="pun">.span class="typ">Requestspan class="pun">.span class="typ">IsAjaxRequestspan class="pun">())span class="pln">
span class="pun">{span class="pln">
filterContextspan class="pun">.span class="typ">HttpContextspan class="pun">.span class="typ">Responsespan class="pun">.span class="typ">StatusCodespan class="pln"> span class="pun">=span class="pln"> span class="lit">500span class="pun">;span class="pln">
filterContextspan class="pun">.span class="typ">ExceptionHandledspan class="pln"> span class="pun">=span class="pln"> span class="kwd">truespan class="pun">;span class="pln">
filterContextspan class="pun">.span class="typ">Resultspan class="pln"> span class="pun">=span class="pln"> span class="kwd">newspan class="pln"> span class="typ">JsonResultspan class="pln">
span class="pun">{span class="pln">
span class="typ">Dataspan class="pln"> span class="pun">=span class="pln"> span class="kwd">newspan class="pln">
span class="pun">{span class="pln">
errorMessage span class="pun">=span class="pln"> filterContextspan class="pun">.span class="typ">Exceptionspan class="pun">.span class="typ">Messagespan class="pln">
span class="pun">},span class="pln">
span class="typ">JsonRequestBehaviorspan class="pln"> span class="pun">=span class="pln"> span class="typ">JsonRequestBehaviorspan class="pun">.span class="typ">AllowGetspan class="pln">
span class="pun">};span class="pln">
span class="pun">}span class="pln">
span class="pun">}span class="pln">
span class="pun">}/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>
之后，我們要給FuckJson()方法加上這個“特征”（Attribute在C#中最好不要翻譯為屬性），然后故意拋個錯做測試。修改后的方法如下：
復(fù)制代碼 代碼如下:
span class="pun">[span class="typ">JsonExceptionFilterAttributespan class="pun">]span class="pln">
span class="kwd">publicspan class="pln"> span class="typ">JsonResultspan class="pln"> span class="typ">FuckJsonspan class="pun">()span class="pln">
span class="pun">{span class="pln">
span class="kwd">tryspan class="pln">
span class="pun">{span class="pln">
span class="kwd">throwspan class="pln"> span class="kwd">newspan class="pln"> span class="typ">Exceptionspan class="pun">(span class="str">"oh shit!"span class="pun">);span class="pln">
span class="kwd">returnspan class="pln"> span class="kwd">newspan class="pln"> span class="typ">JsonResultspan class="pun">()span class="pln">
span class="pun">{span class="pln">
span class="typ">Dataspan class="pln"> span class="pun">=span class="pln"> span class="kwd">newspan class="pln"> span class="typ">Listspan class="str">string>span class="pun">()span class="pln"> span class="pun">{span class="pln"> span class="str">"fuck"span class="pun">,span class="pln"> span class="str">"shit"span class="pln"> span class="pun">},span class="pln"> span class="typ">JsonRequestBehaviorspan class="pln"> span class="pun">=span class="pln"> span class="typ">JsonRequestBehaviorspan class="pun">.span class="typ">AllowGetspan class="pln">
span class="pun">};span class="pln">
span class="pun">}span class="pln">
span class="kwd">catchspan class="pln"> span class="pun">(span class="typ">Exceptionspan class="pln"> exspan class="pun">)span class="pln">
span class="pun">{span class="pln">
span class="kwd">throwspan class="pln"> exspan class="pun">;span class="pln">
span class="pun">}span class="pln">
span class="pun">}/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>
捕獲異常后，你也可以先記一下log、或是根據(jù)你自己的需要處理一下這個異常，然后再throw。
最后我們的AJAX請求代碼也得做修改，增加一個error的處理：
復(fù)制代碼 代碼如下:
span class="pln">$span class="pun">.span class="pln">ajaxspan class="pun">({span class="pln">
urlspan class="pun">:span class="pln"> span class="str">"/Fuck/FuckJson"span class="pun">,span class="pln">
dataspan class="pun">:span class="pln"> span class="str">""span class="pun">,span class="pln">
dataTypespan class="pun">:span class="pln"> span class="str">"json"span class="pun">,span class="pln">
typespan class="pun">:span class="pln"> span class="str">"POST"span class="pun">,span class="pln">
contentTypespan class="pun">:span class="pln"> span class="str">"application/json; charset=utf-8"span class="pun">,span class="pln">
dataFilterspan class="pun">:span class="pln"> span class="kwd">functionspan class="pln"> span class="pun">(span class="pln">dataspan class="pun">)span class="pln"> span class="pun">{span class="pln">
span class="kwd">returnspan class="pln"> dataspan class="pun">;span class="pln">
span class="pun">},span class="pln">
successspan class="pun">:span class="pln"> span class="kwd">functionspan class="pln"> span class="pun">(span class="pln">dataspan class="pun">)span class="pln"> span class="pun">{span class="pln">
alertspan class="pun">(span class="pln">dataspan class="pun">);span class="pln">
span class="pun">},span class="pln">
errorspan class="pun">:span class="pln"> span class="kwd">functionspan class="pln"> span class="pun">(span class="pln">fuckedObjectspan class="pun">)span class="pln"> span class="pun">{span class="pln">
span class="kwd">tryspan class="pln"> span class="pun">{span class="pln">
span class="kwd">varspan class="pln"> json span class="pun">=span class="pln"> $span class="pun">.span class="pln">parseJSONspan class="pun">(span class="pln">fuckedObjectspan class="pun">.span class="pln">responseTextspan class="pun">);span class="pln">
alertspan class="pun">(span class="pln">jsonspan class="pun">.span class="pln">errorMessagespan class="pun">);span class="pln">
span class="pun">}span class="pln"> span class="kwd">catchspan class="pun">(span class="pln">espan class="pun">)span class="pln"> span class="pun">{span class="pln">
alertspan class="pun">(span class="str">'something bad happened'span class="pun">);span class="pln">
span class="pun">}span class="pln">
span class="pun">}span class="pln">
span class="pun">})/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>/span>
現(xiàn)在請求這個Action，會發(fā)現(xiàn)Response的狀態(tài)已經(jīng)是500了。并且返回了Json格式的錯誤信息。
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