如何在C#中实现字典上的linq？_C#_Jquery_Linq_Dictionary_Razor

如何在C#中实现字典上的linq？

c# jquery linq dictionary razor

如何在C#中实现字典上的linq？,c#,jquery,linq,dictionary,razor,C#,Jquery,Linq,Dictionary,Razor,在C#中使用linq on dictionary创建在线考试门户时，我遇到了一个问题。我关心的是获取在线考试类别、子类别。我向数据库服务器请求获取我的数据。现在，我的数据在前端可用，但我正在尝试以一种方便的方式获取记录，以便我可以将我的数据划分为类别、子类别和问题。例如，我希望我的标题和类别如下：- 一般知识基本常识世界地理发明荣誉和奖励数学时间与速度代数学帐目但下面给出的代码显示了我的结果一般知识基本常识基本常识基本常识这是根据每个子类别的问题数量重复的

在C#中使用linq on dictionary创建在线考试门户时，我遇到了一个问题。我关心的是获取在线考试类别、子类别。我向数据库服务器请求获取我的数据。现在，我的数据在前端可用，但我正在尝试以一种方便的方式获取记录，以便我可以将我的数据划分为类别、子类别和问题。例如，我希望我的标题和类别如下：-

一般知识

基本常识
世界地理
发明
荣誉和奖励

数学

时间与速度
代数学
帐目

但下面给出的代码显示了我的结果

一般知识

基本常识
基本常识
基本常识

这是根据每个子类别的问题数量重复的

我使用的代码是

 public ActionResult getOnlineTestTitle()
    {
        List<GopreadyOnlineTest> search;
        if (Session["OnlineTest"] == null)
        {
             search= GopreadyOnlineTest.Search(WebConfigurationManager.ConnectionStrings["liveData"].ConnectionString).ToList();
             Session["OnlineTest"] = search;
        }
        else
        {
            search = (List<GopreadyOnlineTest>)Session["OnlineTest"];
        }            
        List<string> categoryName = search.Select(x => x.CategoryName).Distinct().ToList();
        Dictionary<string, List<GopreadyOnlineTest>> result2 = new Dictionary<string, List<GopreadyOnlineTest>>();
        foreach (string item in categoryName)
        {
            result2.Add(item, search.Where(s => s.CategoryName.ToUpper() == item.ToUpper()).ToList());
        }
        return Json(result2, JsonRequestBehavior.AllowGet);            
    }

请帮忙解决这个问题。如果我用下面这句话来解决这个问题，它是不允许我这样做的

result2.Add(item, search.Where(s => s.CategoryName.ToUpper() == item.ToUpper()).Select(x=>x.SubCategoryName).Distinct().ToList());

这是我的jquery，它正在动态设计页面

function GetOnlineTestTitle() {    
    $.ajax({
        type: "GET",
        url: "getOnlineTestTitle",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: true,
        cache: false,
        success: function (msg) { 
            var htmlString = '';
            alert(JSON.stringify(msg));
            $("#examList").html(htmlString);
            $.each(msg, function (key, val) {
                if (val.length != 0) {
                    htmlString += '<li><h3>' + key + '</h3></li>';
                }
                $.each(val, function (key2, val2) {
                    htmlString += '<li><a href="#"><b>'+val2.SubCategoryName+'</b></a></li>';
                });
            });
            $('#examList').append(htmlString);
        },
        error: function (msg) {
            alert("Error:" + JSON.stringify(msg));
        }
    });
}

函数GetOnlineTestTitle（）{
$.ajax({
键入：“获取”，
url:“getOnlineTestTitle”，
contentType:“应用程序/json；字符集=utf-8”，
数据类型：“json”，
async:true，
cache:false，
成功：函数（msg）{
var htmlString=''；
警报（JSON.stringify（msg））；
$（“#examList”）.html（htmlString）；
$。每个（消息、函数（键、值）{
如果（值长度！=0）{
htmlString+=''+key+''；
}
$.each（val，function）（键2，val2）{
htmlString+=''；
});
});
$（'#examList'）.append（htmlString）；
},
错误：函数（msg）{
警报（“错误：+JSON.stringify（msg））；
}
});
}

您可以使用LINQ中的GroupBy方法来实现这一点，请参见下文

假设您的GopreadyOnlineTest类如下所示：

public class GopreadyOnlineTest
{
    public string CategoryId { get; set; }
    public string CategoryName { get; set; }
    public string SubCategoryId { get; set; }
    public string SubCategoryName { get; set; }
    public string Question { get; set; }
    public string OptionA { get; set; }
    public string OptionB { get; set; }
    public string OptionC { get; set; }
    public string OptionD { get; set; }
    public string QuestionDescription { get; set; }
}

this.search = new List<GopreadyOnlineTest> 
{
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Basic General Knowledge" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "World Geography" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Inventions" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Honours and Awards" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Time & Speed" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Algebra" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Accounts" }
};

[HttpGet]
public JsonResult GetOnlineTestTitle()
{               
    var result = search.GroupBy(x => x.CategoryName)
                       .Select(c => new SampleViewModel 
                                    { 
                                        Category = c.Key, 
                                        SubCategories = c.Select(sc => sc.SubCategoryName).Distinct().ToList() 
                                    });
    return Json(result, JsonRequestBehavior.AllowGet);
}

function GetOnlineTestTitle() {    
    $.ajax({
        type: "GET",
        url: 'GetOnlineTestTitle',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: true,
        cache: false,
        success: function (msg) { 
            $("#examList").html("");
            var divs = msg.map(function (item) {
                var $div = $("<div>"); 
                var $ul = $("<ul>"); 
                var $h3 = $("<h3>").text(item.Category);

                item.SubCategories.forEach(function (itemSub) {
                    $ul.append($("<li>").text(itemSub));
                });
                $div.append($h3);
                $div.append($ul);
                return $div;
            });
            $('#examList').append(divs);
        },
        error: function (msg) {
            alert(JSON.stringify(msg));
        }
    });
}

您的

列表搜索变量包含如下数据：
public class GopreadyOnlineTest
{
    public string CategoryId { get; set; }
    public string CategoryName { get; set; }
    public string SubCategoryId { get; set; }
    public string SubCategoryName { get; set; }
    public string Question { get; set; }
    public string OptionA { get; set; }
    public string OptionB { get; set; }
    public string OptionC { get; set; }
    public string OptionD { get; set; }
    public string QuestionDescription { get; set; }
}

this.search = new List<GopreadyOnlineTest> 
{
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Basic General Knowledge" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "World Geography" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Inventions" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Honours and Awards" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Time & Speed" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Algebra" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Accounts" }
};

[HttpGet]
public JsonResult GetOnlineTestTitle()
{               
    var result = search.GroupBy(x => x.CategoryName)
                       .Select(c => new SampleViewModel 
                                    { 
                                        Category = c.Key, 
                                        SubCategories = c.Select(sc => sc.SubCategoryName).Distinct().ToList() 
                                    });
    return Json(result, JsonRequestBehavior.AllowGet);
}

function GetOnlineTestTitle() {    
    $.ajax({
        type: "GET",
        url: 'GetOnlineTestTitle',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: true,
        cache: false,
        success: function (msg) { 
            $("#examList").html("");
            var divs = msg.map(function (item) {
                var $div = $("<div>"); 
                var $ul = $("<ul>"); 
                var $h3 = $("<h3>").text(item.Category);

                item.SubCategories.forEach(function (itemSub) {
                    $ul.append($("<li>").text(itemSub));
                });
                $div.append($h3);
                $div.append($ul);
                return $div;
            });
            $('#examList').append(divs);
        },
        error: function (msg) {
            alert(JSON.stringify(msg));
        }
    });
}

在前端，您的javascript应该是这样的：
public class GopreadyOnlineTest
{
    public string CategoryId { get; set; }
    public string CategoryName { get; set; }
    public string SubCategoryId { get; set; }
    public string SubCategoryName { get; set; }
    public string Question { get; set; }
    public string OptionA { get; set; }
    public string OptionB { get; set; }
    public string OptionC { get; set; }
    public string OptionD { get; set; }
    public string QuestionDescription { get; set; }
}

this.search = new List<GopreadyOnlineTest> 
{
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Basic General Knowledge" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "World Geography" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Inventions" },
    new GopreadyOnlineTest { CategoryName = "General Knowledge", SubCategoryName = "Honours and Awards" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Time & Speed" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Algebra" },
    new GopreadyOnlineTest { CategoryName = "Maths", SubCategoryName = "Accounts" }
};

[HttpGet]
public JsonResult GetOnlineTestTitle()
{               
    var result = search.GroupBy(x => x.CategoryName)
                       .Select(c => new SampleViewModel 
                                    { 
                                        Category = c.Key, 
                                        SubCategories = c.Select(sc => sc.SubCategoryName).Distinct().ToList() 
                                    });
    return Json(result, JsonRequestBehavior.AllowGet);
}

function GetOnlineTestTitle() {    
    $.ajax({
        type: "GET",
        url: 'GetOnlineTestTitle',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: true,
        cache: false,
        success: function (msg) { 
            $("#examList").html("");
            var divs = msg.map(function (item) {
                var $div = $("<div>"); 
                var $ul = $("<ul>"); 
                var $h3 = $("<h3>").text(item.Category);

                item.SubCategories.forEach(function (itemSub) {
                    $ul.append($("<li>").text(itemSub));
                });
                $div.append($h3);
                $div.append($ul);
                return $div;
            });
            $('#examList').append(divs);
        },
        error: function (msg) {
            alert(JSON.stringify(msg));
        }
    });
}

函数GetOnlineTestTitle（）{
$.ajax({
键入：“获取”，
url:'GetOnlineTestTitle'，
contentType:“应用程序/json；字符集=utf-8”，
数据类型：“json”，
async:true，
cache:false，
成功：函数（msg）{
$（“#examList”）.html（“”）；
var divs=msg.map（函数（项）{
变量$div=$（“”）；
var$ul=$（“”）；
var$h3=$（“”）.text（item.Category）；
item.SubCategories.forEach（功能（itemSub）{
$ul.append（$（“”）.text（itemSub））；
});
$div.append（$h3）；
$div.append（$ul）；
返回$div；
});
$（'examList'）。追加（divs）；
},
错误：函数（msg）{
警报（JSON.stringify（msg））；
}
});
}

您可以看到它在这里工作：
由于上面的代码更具说教性，我为您的案例添加了以下几乎真实的代码：
public ActionResult getOnlineTestTitle()
{
    var connectionString = WebConfigurationManager.ConnectionStrings["liveData"].ConnectionString;
    List<GopreadyOnlineTest> search = Session["OnlineTest"] as List<GopreadyOnlineTest> 
                                      ?? GopreadyOnlineTest.Search(connectionString).ToList();

    Session["OnlineTest"] = search;

    var result = search.GroupBy(x => x.CategoryName)
                       .Select(c => new SampleViewModel 
                                    { 
                                        Category = c.Key, 
                                        SubCategories = c.Select(sc => sc.SubCategoryName).Distinct().ToList() 
                                    });
    return Json(result, JsonRequestBehavior.AllowGet);            
}

公共操作结果getOnlineTestTitle（）
{
var connectionString=WebConfiguration Manager.connectionString[“liveData”]。connectionString；
列表搜索=会话[“OnlineTest”]作为列表
？？GopreadyOnlineTest.Search（connectionString.ToList（）；
会话[“OnlineTest”]=搜索；
var result=search.GroupBy（x=>x.CategoryName）
.选择（c=>new SampleViewModel
{ 
类别=c键，
SubCategories=c.Select（sc=>sc.subcategorityname）.Distinct（）.ToList（）
});
返回Json（结果，JsonRequestBehavior.AllowGet）；
}
I gess你应该使用GroupBy
我也试过了。但是没有成功。：-）你能发布你的视图显示类别吗？我也面临同样的问题。@kcwu我正在使用ajax调用设计布局。谢谢@Alberto Moteiro。你为我节省了很多时间。@RaviKantHudda我很高兴能帮助你！！我仍然面临同样的问题。实际上，我必须从数据库中获取数据。假设基本常识有4条记录，这是重复4次。新GOPREADYONLINEST{CategoryName=“General Knowledge”，SubCategoryName=“Basic General Knowledge”}，新GOPREADYONLINEST{CategoryName=“General Knowledge”，SubCategoryName=“Basic General Knowledge”}，新GOPREADYONLINEST{CategoryName=“General Knowledge”，SubCategoryName=“基本常识”}，@RaviKantHudda是从您的数据库提交的数据，对吗？是的，它来自数据库。但如果您能解决上述给定的问题，那对您来说太好了。假设我将基本常识重复3次，那么您的解决方案将如何解决问题。