.Net MVC4 Action Method 参数在 jqGrid 帖子中为空答案

【问题标题】：.Net MVC4 Action Method parameter is null from jqGrid post.Net MVC4 Action Method 参数在 jqGrid 帖子中为空
【发布时间】：2013-03-22 12:47:57
【问题描述】：

我浏览了很多关于这个主题的帖子，但到目前为止我还没有解决我的问题。我是 MVC / Jquery 的新手，所以我可能错过了答案。

我希望从 jqGrid 返回所有行。我已经使用 Oleg 的示例代码进行 jqGrid 处理：

    sendData = function (data) {
        var dataToSend = JSON.stringify(data);
        alert("The following data are sending to the server:\n" + dataToSend);
        $.ajax({
            type: "POST",
            url: '@Url.Action("Update", "WatchList")',
            dataType: "json",
            data: dataToSend,
            loadonce: true,
            contentType: "application/json; charset=utf-8",
            success: function (response, textStatus, jqXHR) {
                // remove error div if exist
                $('#' + grid[0].id + '_err').remove();
                alert("Updates Complete");
            },
            error: function (jqXHR, textStatus, errorThrown) {
                // remove error div if exist
                $('#' + grid[0].id + '_err').remove();
                // insert div with the error description before the grid
                grid.closest('div.ui-jqgrid').before(
                    '<div id="' + grid[0].id + '_err" style="max-width:' + grid[0].style.width +
                    ';"><div class="ui-state-error ui-corner-all" style="padding:0.7em;float:left;"><span class="ui-icon ui-icon-alert" ' +
                    'style="float:left; margin-right: .3em;"></span><span style="clear:left">' +
                    decodeErrorMessage(jqXHR, textStatus, errorThrown) + '</span></div><div style="clear:left"/></div>');
            }

        $("#sendAll").click(function () {
            var localGridData = grid.jqGrid('getGridParam', 'data');
            sendData(localGridData);
        });

    };

帖子的提琴手输出是：

POST http://localhost:49323/WatchList/Update HTTP/1.1
Host: localhost:49323
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/json; charset=utf-8
X-Requested-With: XMLHttpRequest
Referer: http://localhost:49323/WatchList/Edit
Content-Length: 3645
Cookie: __RequestVerificationToken=flUoW7U12gHRfOVMNiLu_tW4G_oVI4TwxvAYKOU9arGI014KWFKUKjUbgjbZStLb7n1TGmU22NtoQjAb26bmjcccjg8x6skcL1zbP_o2y5I1; .ASPXAUTH=D968251D718DEF7CA0C9D4A6BD2750F9923CBF554FC0B058772C753C4305682578C207F7367B6D61F80F84CBDCA5C130126AE2CC5E1715FA897122DEB68B3B40C86816C32A6F047891794A732F4A7A3499064220077793B5F1313813FFC21D01
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

[{"Date":"Fri 22 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"0"},{"Date":"Sat 23 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"1"},{"Date":"Sun 24 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"2"},{"Date":"Mon 25 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"3"},{"Date":"Tue 26 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"4"},{"Date":"Wed 27 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"5"},{"Date":"Thu 28 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"6"},{"Date":"Fri 29 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"7"},{"Date":"Sat 30 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"8"},{"Date":"Sun 31 March 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"9"},{"Date":"Mon 1 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"10"},{"Date":"Tue 2 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"11"},{"Date":"Wed 3 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"12"},{"Date":"Thu 4 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"13"},{"Date":"Fri 5 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"14"},{"Date":"Sat 6 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"15"},{"Date":"Sun 7 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"16"},{"Date":"Mon 8 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"17"},{"Date":"Tue 9 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"18"},{"Date":"Wed 10 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"19"},{"Date":"Thu 11 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"20"},{"Date":"Fri 12 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"21"},{"Date":"Sat 13 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"22"},{"Date":"Sun 14 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"23"},{"Date":"Mon 15 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"24"},{"Date":"Tue 16 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"25"},{"Date":"Wed 17 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"26"},{"Date":"Thu 18 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"27"},{"Date":"Fri 19 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"28"},{"Date":"Sat 20 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"29"},{"Date":"Sun 21 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"30"},{"Date":"Mon 22 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"31"},{"Date":"Tue 23 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"32"}]

控制器接收到的参数为空？我没有将数据直接导入的模型，因为网格列是动态创建的，因此我需要解析原始数据。在我的控制器操作中我需要什么来获取发布数据？

【问题讨论】：

请在您的问题中包含操作方法
我对动作结果所做的只是尝试查看返回值：
我对操作结果所做的只是尝试查看返回的数据，例如public ActionResult WatchList([FromBody]string rows) { 和其他变体，但只会得到空值。我认为我可能能够从 FormCollection 中获取数据，但它也没有出现在那里。我想我需要了解更多关于 MVC 参数映射的信息。

标签： asp.net-mvc jqgrid

【解决方案1】：

您的更改必须关闭，因为现在正在识别数据但出现错误

 Invalid JSON primitive: griddata.]
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid JSON primitive: griddata.

[ArgumentException: Invalid JSON primitive: griddata.]
   System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject() +915
   System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth) +597
   System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer) +108
   System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit) +211
   System.Web.Script.Serialization.JavaScriptSerializer.DeserializeObject(String input) +86
   System.Web.Mvc.JsonValueProviderFactory.GetDeserializedObject(ControllerContext controllerContext) +298
   System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) +123
   System.Web.Mvc.<>c__DisplayClassc.<GetValueProvider>b__7(ValueProviderFactory factory) +59
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +145
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +171
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +460
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +58
   System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext) +360
   System.Web.Mvc.ControllerBase.get_ValueProvider() +85
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +154
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +199
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__1e(AsyncCallback asyncCallback, Object asyncState) +978
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +161
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +92
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag) +53
   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +523
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState) +83
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +161
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +92
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag, Int32 timeout) +97
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag) +53
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +501
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +161
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +92
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag, Int32 timeout) +97
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag) +53
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +417
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +49
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback asyncCallback, Object asyncState) +127
   System.Web.Mvc.Async.WrappedAsyncResult`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +161
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +92
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag, Int32 timeout) +97
   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate endDelegate, Object tag) +53
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +373
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +88
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +50
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +301
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

我注意到如果我使用原始代码：

    data: dataToSend,

帖子数据在 Fiddler 中显示为：

[{"Date":"Fri 29 March 2013","id":"0"},{"Date":"Sat 30 March 2013","id":"1"},{"Date":"Sun 31 March 2013","id":"2"},{"Date":"Mon 1 April 2013","id":"3"},{"Date":"Tue 2 April 2013","id":"4"},{"Date":"Wed 3 April 2013","id":"5"},{"Date":"Thu 4 April 2013","id":"6"},{"Date":"Fri 5 April 2013","id":"7"},{"Date":"Sat 6 April 2013","id":"8"},{"Date":"Sun 7 April 2013","id":"9"},{"Date":"Mon 8 April 2013","id":"10"},{"Date":"Tue 9 April 2013","id":"11"},{"Date":"Wed 10 April 2013","id":"12"},{"Date":"Thu 11 April 2013","id":"13"},{"Date":"Fri 12 April 2013","id":"14"},{"Date":"Sat 13 April 2013","id":"15"},{"Date":"Sun 14 April 2013","id":"16"},{"Date":"Mon 15 April 2013","id":"17"},{"Date":"Tue 16 April 2013","id":"18"},{"Date":"Wed 17 April 2013","id":"19"},{"Date":"Thu 18 April 2013","id":"20"},{"Date":"Fri 19 April 2013","id":"21"},{"Date":"Sat 20 April 2013","id":"22"},{"Date":"Sun 21 April 2013","id":"23"},{"Date":"Mon 22 April 2013","id":"24"},{"Date":"Tue 23 April 2013","id":"25"},{"Date":"Wed 24 April 2013","id":"26"},{"Date":"Thu 25 April 2013","id":"27"},{"Date":"Fri 26 April 2013","id":"28"},{"Date":"Sat 27 April 2013","id":"29"},{"Date":"Sun 28 April 2013","id":"30"},{"Date":"Mon 29 April 2013","id":"31"},{"Date":"Tue 30 April 2013","Night":"False","Morning":"False","Afternoon":"False","Evening":"False","id":"32"}]

如果使用

数据：{griddata:dataToSend}，

数据在 Fiddler 中显示为：

griddata=%5B%7B%22Date%22%3A%22Fri+29+March+2013%22%2C%22id%22%3A%220%22%7D%2C%7B%22Date%22%3A%22Sat+30+March+2013%22%2C%22id%22%3A%221%22%7D%2C%7B%22Date%22%3A%22Sun+31+March+2013%22%2C%22id%22%3A%222%22%7D%2C%7B%22Date%22%3A%22Mon+1+April+2013%22%2C%22id%22%3A%223%22%7D%2C%7B%22Date%22%3A%22Tue+2+April+2013%22%2C%22id%22%3A%224%22%7D%2C%7B%22Date%22%3A%22Wed+3+April+2013%22%2C%22id%22%3A%225%22%7D%2C%7B%22Date%22%3A%22Thu+4+April+2013%22%2C%22id%22%3A%226%22%7D%2C%7B%22Date%22%3A%22Fri+5+April+2013%22%2C%22id%22%3A%227%22%7D%2C%7B%22Date%22%3A%22Sat+6+April+2013%22%2C%22id%22%3A%228%22%7D%2C%7B%22Date%22%3A%22Sun+7+April+2013%22%2C%22id%22%3A%229%22%7D%2C%7B%22Date%22%3A%22Mon+8+April+2013%22%2C%22id%22%3A%2210%22%7D%2C%7B%22Date%22%3A%22Tue+9+April+2013%22%2C%22id%22%3A%2211%22%7D%2C%7B%22Date%22%3A%22Wed+10+April+2013%22%2C%22id%22%3A%2212%22%7D%2C%7B%22Date%22%3A%22Thu+11+April+2013%22%2C%22id%22%3A%2213%22%7D%2C%7B%22Date%22%3A%22Fri+12+April+2013%22%2C%22id%22%3A%2214%22%7D%2C%7B%22Date%22%3A%22Sat+13+April+2013%22%2C%22id%22%3A%2215%22%7D%2C%7B%22Date%22%3A%22Sun+14+April+2013%22%2C%22id%22%3A%2216%22%7D%2C%7B%22Date%22%3A%22Mon+15+April+2013%22%2C%22id%22%3A%2217%22%7D%2C%7B%22Date%22%3A%22Tue+16+April+2013%22%2C%22id%22%3A%2218%22%7D%2C%7B%22Date%22%3A%22Wed+17+April+2013%22%2C%22id%22%3A%2219%22%7D%2C%7B%22Date%22%3A%22Thu+18+April+2013%22%2C%22id%22%3A%2220%22%7D%2C%7B%22Date%22%3A%22Fri+19+April+2013%22%2C%22id%22%3A%2221%22%7D%2C%7B%22Date%22%3A%22Sat+20+April+2013%22%2C%22id%22%3A%2222%22%7D%2C%7B%22Date%22%3A%22Sun+21+April+2013%22%2C%22id%22%3A%2223%22%7D%2C%7B%22Date%22%3A%22Mon+22+April+2013%22%2C%22id%22%3A%2224%22%7D%2C%7B%22Date%22%3A%22Tue+23+April+2013%22%2C%22id%22%3A%2225%22%7D%2C%7B%22Date%22%3A%22Wed+24+April+2013%22%2C%22id%22%3A%2226%22%7D%2C%7B%22Date%22%3A%22Thu+25+April+2013%22%2C%22id%22%3A%2227%22%7D%2C%7B%22Date%22%3A%22Fri+26+April+2013%22%2C%22id%22%3A%2228%22%7D%2C%7B%22Date%22%3A%22Sat+27+April+2013%22%2C%22id%22%3A%2229%22%7D%2C%7B%22Date%22%3A%22Sun+28+April+2013%22%2C%22id%22%3A%2230%22%7D%2C%7B%22Date%22%3A%22Mon+29+April+2013%22%2C%22id%22%3A%2231%22%7D%2C%7B%22Date%22%3A%22Tue+30+April+2013%22%2C%22Night%22%3A%22False%22%2C%22Morning%22%3A%22False%22%2C%22Afternoon%22%3A%22False%22%2C%22Evening%22%3A%22False%22%2C%22id%22%3A%2232%22%7D%5D

【讨论】：

【解决方案2】：

尝试这样修改：

 function sendData(data) {
        var dataToSend = JSON.stringify(data);
        alert("The following data are sending to the server:\n" + dataToSend);
        $.ajax({
            type: "POST",
            url: '@Url.Action("WatchList", "Update")',
            dataType: "json",
            data: {griddata:dataToSend},
            loadonce: true,
            contentType: "application/json; charset=utf-8",
            success: function (response, textStatus, jqXHR) {
                // remove error div if exist
                $('#' + grid[0].id + '_err').remove();
                alert("Updates Complete");
            },
            error: function (jqXHR, textStatus, errorThrown) {
                // remove error div if exist
                $('#' + grid[0].id + '_err').remove();
                // insert div with the error description before the grid
                grid.closest('div.ui-jqgrid').before(
                    '<div id="' + grid[0].id + '_err" style="max-width:' + grid[0].style.width +
                    ';"><div class="ui-state-error ui-corner-all" style="padding:0.7em;float:left;"><span class="ui-icon ui-icon-alert" ' +
                    'style="float:left; margin-right: .3em;"></span><span style="clear:left">' +
                    decodeErrorMessage(jqXHR, textStatus, errorThrown) + '</span></div><div style="clear:left"/></div>');
            }

        $("#sendAll").click(function () {
            var localGridData = grid.jqGrid('getGridParam', 'data');
            sendData(localGridData);
        });

    };

在控制器中：

public ActionResult WatchList(string griddata) { 
........
}

【讨论】：

您的更改使我前进，但随后出现了序列化问题（见上文）。这个评论部分对我的回复来说不够大，所以我添加了一个进一步的答案，认为它会以对话模式回答你的。它没有，我的答案出现在你的面前。我显然需要更好地了解如何使用 Stack Overflow 线程。
我注意到的另一件事是，您的操作名称是监视列表，您提供的网址是监视列表/更新。请将其修改为“url：'@Url.Action("WatchList", "Update")'"（我现在已在此答案中更正它。）
终于有了数据。我根据您的建议所做的更改是将内容类型更改为： contentType: "application/x-www-form-urlencoded; charset=utf-8" 看起来需要这样才能匹配自动发生的编码。我假设 MVC 不需要 json 内容类型，只需要数据类型。
抱歉耽搁了。这个问题就解决了。毫无疑问，未来还有很多。感谢您的帮助。
接受或赞成答案将不胜感激:)