小编Yec*_*ats的帖子

所以,首先我已经阅读了大量关于这个特定问题的线索,我仍然不明白如何解决它.基本上,我正在尝试与websocket进行通信,并将收到的消息存储在绑定到listview的可观察集合中.我知道我正在从套接字中正确地获得响应,但是当它尝试将其添加到observable集合时,它会给我以下错误:

The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

我已经阅读了一些关于"发送"以及其他一些事情的信息,但我只是大肆混淆!这是我的代码:

public ObservableCollection<string> messageList  { get; set; }
private void MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
    {
        string read = "";
        try
        {
            using (DataReader reader = args.GetDataReader())
            {
                reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
                read = reader.ReadString(reader.UnconsumedBufferLength);
            }
        }
        catch (Exception ex) // For debugging
        {
            WebErrorStatus status = WebSocketError.GetStatus(ex.GetBaseException().HResult);
            // Add your specific error-handling code here.
        }


        if (read != "")
           messageList.Add(read); // this is …

我正在尝试使用AJAX/Jquery和c#写入我的数据库.每当我将参数传递给C#代码时,它都显示为null.我正在使用visual studio在创建控制器类时生成的默认模板.任何帮助,将不胜感激!

NOte:这是我打算打电话给的休息服务.(一个普通的ASP网站......不是MVC.而且,GET Rest api非常有效.)

jQuery的/ AJAX:

        var dataJSON = { "name": "test" }

        $('#testPostMethod').bind("click", GeneralPost);
        function GeneralPost() {
            $.ajax({
                type: 'POST',
                url: '../api/NewRecipe',
                data:JSON.stringify(dataJSON),
                contentType: 'application/json; charset=utf-8',
                dataType: 'json'
            });
        }

C#

    //If I remove the [FromBody] Tag then when I click the button this method is never called.
    public void Post([FromBody]string name)

    {

    }

编辑:

我稍微调整了我的代码,但仍遇到同样的问题.回顾一下,它正在加载POST方法,但它传入的是null.

C#

 public class RecipeInformation
    {
        public string name { get; set; }

    }

        public void Post(RecipeInformation information)

        {

        }

AJAX:

    var dataJSON …

我正在尝试设置我的Jquery UI自动完成字段以获取来自ajax连接的数据.到目前为止,这是我的代码:

            $("#mainIngredientAutoComplete").autocomplete({
                source: function (request, response) {
                    $.ajax({
                        url: "../api/IngredientChoices",
                        dataType: "json",
                        success: function (data) {
                            response(function (item) {
                                return {
                                    label: item.MainName,
                                    value: item.MainItemID
                                }
                            });
                        }
                    });
                }
            });

这是我的JSON:

[{"SubItemID":1,"MainItemID":1,"SubName":"2%","MainName":"Milk"},{"SubItemID":2,"MainItemID":1,"SubName":"Skim/Fat Free","MainName":"Milk"},{"SubItemID":3,"MainItemID":2,"SubName":"Chedder","MainName":"Cheese"}]

HTML:

<table id="tbl_ingredients" style="padding:0px;">
                <tr id="ingHeader">
                    <td>Ingredient</td>
                    <td>Measurement</td>
                    <td>Amount</td>
                    <td><input id="mainIngredientAutoComplete" /></td>
                    <td></td>
                </tr>
</table>

当我开始输入"mil"(用于牛奶)时,我的代码给了我这个错误:

编辑:

我做了一些改变,但有一些尝试,但现在我得到了一个新的错误 -

[URL]第55行第25行未处理的异常

0x800a1391 - Microsoft JScript运行时错误:'data'未定义

        $("#mainIngredientAutoComplete").autocomplete({
            source: function (request, response) {
                $.ajax({
                    url: "../api/IngredientChoices",
                    dataType: "json",
                    response: ($.map(data, function(v,i){
                        return {
                            label: v.MainName,
                            value: v.MainItemID

                        }})) …

我有一个Ajax.BeginForm调用,它应该返回一个局部视图但是将页面重新路由到Action.关于什么是错的任何想法？

这是我要在部分视图上呈现的主页面上的代码:

    <div class="col-md-6">
        @using (Ajax.BeginForm("Search", "Home", new AjaxOptions
        {
            HttpMethod = "GET",
            InsertionMode = InsertionMode.Replace,
            UpdateTargetId = "searchResults"
        }))
        {

        <div class="form-group" style="width:85%;">
            <div class="right-inner-addon">
                <i class=" glyphicon glyphicon-search"></i>
                <input type="text" data-autocomplete="@Url.Action("Quicksearch","Home")" class="form-control" placeholder="Search" name="q" />
            </div>
        </div>
        <div class="form-group">
            <button class="btn btn-default form-inline" type="submit">Search</button>
        </div>
        }
        <br />

    </div>

</div>
<div id="searchResults">

</div>

这是部分视图(由于长度而删除的项目):

    <div class="row" id="searchResults">
     ...removed form elements
       <div class="row">
            <table class="table">
    ....stuff
    </table>
    </div>
</div>

这是控制器:

   public PartialViewResult Search(string q)
    {
        var items = db.items_with_descriptions …

我需要一些帮助来实现Dijkstra的算法,并希望有人能够帮助我.我有它,所以它打印一些路线,但它没有捕获路径的正确成本.

这是我的节点结构:

   class Node
    {
        public enum Color {White, Gray, Black};
        public string Name { get; set; } //city
        public List<NeighborNode> Neighbors { get; set; } //Connected Edges
        public Color nodeColor = Color.White;
        public int timeDiscover { get; set; }//discover time
        public int timeFinish { get; set; } // finish time

        public Node() 
        { 
            Neighbors = new List<NeighborNode>();
        }
        public Node(string n, int discover)
        {
            Neighbors = new List<NeighborNode>();
            this.Name = n;
            timeDiscover = discover;
        }


        public Node(string n, NeighborNode …

免责声明：我是 ASP.NET Core / Razor / MVC 的新手，正在开始使用 3.0 预览版。

我想要做的是在我的页面上有一个“按钮”，将一个新的空项目添加到列表中，以便用户可以输入一些值。从我所读到的（相当多），听起来像拥有指向控制器的超链接点是正确的方法。我无法让它实际工作。这是我的代码：

指向控制器/动作的链接：

<a class="btn btn-success" asp-controller="Customer" asp-action="AddProduct">New Product</a>

控制器：

    public class CustomerController : Controller
{
    public void AddProduct()
    {

        var tmp = "";

    }

    public string Index()
    {
        return "This is my default action...";
    }

    public string Welcome()
    {
        return "This is the Welcome action method...";
    }

}

Startup.cs 路由是默认的：

        app.UseRouting(routes =>
        {
            routes.MapRazorPages();
        });

使用此设置，如果我单击开始按钮，我会看到 URL 更改为以下内容，但没有其他任何反应（例如，未命中断点）：

https://localhost:44358/Customers/Create?action=AddProduct&controller=Customer

我试图将路由添加到专门的 UseRouting 代码中，如下所示：

            app.UseRouting(routes =>
        {
            routes.MapRazorPages();
            routes.MapControllerRoute(
                name: "Customer", …

我收到以下错误:

无法将类型'System.Collections.Generic.IEnumerable'隐式转换为'System.Collections.Generic.List'.存在显式转换(您是否错过了演员？)

我的代码如下:

 public Profile PullActiveProfile()
  {
   //currentProfile.Decks = new List<string>();
    return currentProfile = (from profiles in xmlDoc.Element("PlayerPofiles").Elements("Player")where (string)profiles.Element("Active") == "True"
    select new Profile
      {
       Name = (string)profiles.Element("Name"),
       Type = (string)profiles.Element("Type"),
       Verified = (string)profiles.Element("Verified"),
       Password = (string)profiles.Element("Password"),
       Email = (string)profiles.Element("Email"),
       Sex = (string)profiles.Element("Sex"),
       Avatar = (string)profiles.Element("Avatar").Attribute("path") ?? "",
       Created = (DateTime)profiles.Element("Created"),
       Birthday = (string)profiles.Element("Birthday") ?? "",
       Wins = (string)profiles.Element("Ratio").Element("Win") ?? "0",
       Losses = (string)profiles.Element("Ratio").Element("Loss") ?? "0",
       Abandoned = (string)profiles.Element("Ratio").Element("Abandoned"),
       // The following line is where I get the error. The …

我想在单击页面上的按钮时执行我直接在 razor 页面上编写的 C# 方法。我发现，如果我引用了页面上的按钮，它会在第一次加载时执行该方法，但当我实际单击该按钮时，它不会再次执行。这是代码：

Razor 页面 C# 参考：

@functions
{
    int productIndex = 0;

    int AddProduct()
    {
        productIndex = productIndex + 1;
        return productIndex;
    }
}

按钮参考：

 <button type="button" class="btn btn-success" onclick="@AddProduct()" value="New Product" />

我也尝试过这个参考并得到相同的结果：

<input class="btn btn-success" onclick="@AddProduct()" value="New Product"/>

我的第二部分问题是如何阻止它在页面加载时执行，以便它只在单击时运行？我找到了参考文献，Page.IsPostBack)但这似乎在客户端上未被识别。

我收到以下错误:

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'Munchkin.Model.PlayerProfiles.Profile'. An explicit conversion exists (are you missing a cast?)

我的代码是:

Profile currentProfile;

public Profile ActiveProfile()
{
    currentProfile = new Profile();        
    return currentProfile = 
        (from profiles in xmlDoc.Element("PlayerPofiles").Element("Online").Elements("Player")
        where (string)profiles.Element("Active") == "True"
        select new Profile
        {
            Name = (string)profiles.Element("Name"),
            Sex = (string)profiles.Element("Sex"),
            Avatar = (string)profiles.Element("Avatar").Attribute("path") ?? "",
            Created = (DateTime)profiles.Element("Created"),
            Birthday = (string)profiles.Element("Birthday"),
            Wins = (string)profiles.Element("Ratio").Element("Win"),
            Losses = (string)profiles.Element("Ratio").Element("Loss"),
            Abandoned = (string)profiles.Element("Ratio").Element("Abandoned")
        });
}

我收到以下错误:

参数字典包含非可空类型'System.Int32'的参数'id'的空条目,用于'RecipeTracker.Controllers.StandardDirectionsController'中的方法'System.String Get(Int32)'.可选参数必须是引用类型,可空类型,或者声明为可选参数.

我在我的全局文件中定义了这个:

    protected void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        RouteTable.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = System.Web.Http.RouteParameter.Optional });
    }

这是我的控制器:

    App_Data.databaseDataContext _context = new App_Data.databaseDataContext();
    // GET api/<controller>
    public List<string> Get()
    {
        var direction = (from d in _context.ViewStandardDirections("-1")
                         select d.Direction);

        return direction.ToList();
    }

    // GET api/<controller>/5
    public List<Models.DirectionChoices> Get([FromUri]string q)
    {
        var choices = (from i in _context.ViewStandardDirections(q)
                       select new Models.DirectionChoices
                       {
                           text = i.Direction
                       });
        return …