首页 \ 问答 \ 从数据库连接两个表，并在MVC的下拉列表中显示一个列值(Join two tables from database and display one column values in dropdown list in MVC)

从数据库连接两个表，并在MVC的下拉列表中显示一个列值(Join two tables from database and display one column values in dropdown list in MVC)

 我有以下查询。 
 我想加入两个表格并在下拉列表中显示一列。 
 

 控制器代码： 
 

// GET: SelectLLD
public ActionResult Index()
{

    var sLoginName = Session["LoginName"];
    var iLoginId = Session["LoginID"];

    if(sLoginName!= null)
    {
        ViewBag.LoginId = iLoginId;


        //Db context object 
        enterpriseEntities db = new enterpriseEntities();

        var lob = from l in db.Lobs
                  join r in db.Rights
                  on l.LobID equals r.LobID
                  //where r.LoginID =
                  select new
                  {
                      l.LobName

                  };
        SelectList list = new SelectList (lob, "lobname");

        ViewBag.LobNames = list;
        return View();

    }
    else{

        return RedirectToAction("Index", "Login");
    }


}

 

 查看代码： 
 

@{
    ViewBag.Title = "Index";
}
<h4>Welcome @Session["LoginName"]</h4>
<h4>@ViewBag.LoginId</h4>
<h3>Select LOB</h3>

<div>
    @Html.DropDownList("LobNames", "Select a Value")
</div>
<h3>Select Bussiness Date </h3>

 

 问题是，通过上面的代码，我得到了在下拉列表中添加了列值的列名称。 以下是屏幕截图 
 

 我得到了列名和价值。 我得到了列名和价值
 

 我只想要列值显示在下拉列表中。 例如，只应显示“销售”值。 

I have the below query.
 I want to join two tables and display the one column in the drop-down list.
 

The controller code: 
 

// GET: SelectLLD
public ActionResult Index()
{

    var sLoginName = Session["LoginName"];
    var iLoginId = Session["LoginID"];

    if(sLoginName!= null)
    {
        ViewBag.LoginId = iLoginId;


        //Db context object 
        enterpriseEntities db = new enterpriseEntities();

        var lob = from l in db.Lobs
                  join r in db.Rights
                  on l.LobID equals r.LobID
                  //where r.LoginID =
                  select new
                  {
                      l.LobName

                  };
        SelectList list = new SelectList (lob, "lobname");

        ViewBag.LobNames = list;
        return View();

    }
    else{

        return RedirectToAction("Index", "Login");
    }


}

 

The view Code:
 

@{
    ViewBag.Title = "Index";
}
<h4>Welcome @Session["LoginName"]</h4>
<h4>@ViewBag.LoginId</h4>
<h3>Select LOB</h3>

<div>
    @Html.DropDownList("LobNames", "Select a Value")
</div>
<h3>Select Bussiness Date </h3>

 

The problem is that with the above code I an getting the column name also added with the column value in the drop-down list. Below is the screen shot 
 

I am getting the out having column name and the value. i am getting the out having column name and the value
 

I want only the column values to be displayed in the drop-down. For example only the "Sales" value should be displayed.

原文：https://stackoverflow.com/questions/43867575
更新时间：2022-04-22 07:04

最满意答案

 我检查了您的Svg，并且您的svg中有错误。 所以我重新创建了svg并导入到我的drawable中。 直接使用这个xml作为drawable。 它由SVG生成 
 

 
 
 ic_smile_new.xml 
 

 

<vector android:height="24dp" android:viewportHeight="256.0"
    android:viewportWidth="256.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#2A2853" android:pathData="M125.3,159.6C82.68,159.6 48,124.92 48,82.3C48,39.68 82.68,5 125.3,5s77.3,34.68 77.3,77.3C202.6,124.92 167.92,159.6 125.3,159.6zM125.3,6C83.23,6 49,40.23 49,82.3c0,42.07 34.23,76.3 76.3,76.3c42.07,0 76.3,-34.23 76.3,-76.3C201.6,40.23 167.37,6 125.3,6z"/>
    <path android:fillColor="#2A2853" android:pathData="M102.11,55.73m-12.07,0a12.07,12.07 0,1 1,24.15 0a12.07,12.07 0,1 1,-24.15 0"/>
    <path android:fillColor="#2A2853" android:pathData="M158.63,58.63m-12.07,0a12.07,12.07 0,1 1,24.15 0a12.07,12.07 0,1 1,-24.15 0"/>
    <path android:fillColor="#2A2853" android:pathData="M161.32,109.66c-19.32,19.8 -50.23,19.32 -69.07,-0.48c-2.9,-2.9 -7.24,1.45 -4.35,4.35c21.25,22.22 56.51,22.22 77.77,0.48C168.57,111.11 164.22,106.76 161.32,109.66L161.32,109.66z"/>
    <path android:fillColor="#F6BE19" android:pathData="M183.26,48.97h-1.93c-2.41,-6.76 -10.63,-7.24 -20.29,-7.24c-1.45,0 -2.9,0 -3.86,0c-1.45,0 -2.9,0 -3.87,0c-9.66,0 -17.87,0.48 -20.29,7.24h-8.69c-2.41,-6.76 -10.63,-7.24 -20.29,-7.24c-1.45,0 -2.9,0 -3.86,0c-1.45,0 -2.9,0 -3.86,0c-9.66,0 -17.87,0.48 -20.29,7.24H74.1c-2.9,0 -5.31,2.41 -5.31,5.31c0,2.9 2.41,5.31 5.31,5.31h1.45c2.42,11.59 12.56,20.29 24.63,20.29c12.07,0 22.7,-8.69 24.63,-20.29h7.73c2.42,11.59 12.56,20.29 24.64,20.29c12.07,0 22.7,-8.69 24.63,-20.29h1.45c2.9,0 5.31,-2.41 5.31,-5.31C188.58,51.39 186.16,48.97 183.26,48.97zM111.29,67.33H88.11c-0.48,0 -1.45,0 -1.93,-2.9h26.57C112.26,67.33 111.78,67.33 111.29,67.33zM91.49,70.22h15.46c-2.41,0 -4.83,1.93 -7.73,1.93C96.32,72.16 93.9,70.22 91.49,70.22zM115.16,62.01H83.28c-0.48,-2.9 -0.48,-1.93 -0.48,-2.9h33.33C115.64,60.08 115.64,59.6 115.16,62.01zM168.29,67.33h-23.19c-0.48,0 -1.45,0 -1.93,-2.9h26.57C169.74,67.33 169.26,67.33 168.29,67.33zM148.97,70.22h15.46c-2.41,0 -4.83,1.93 -7.73,1.93C154.28,72.16 151.38,70.22 148.97,70.22zM172.64,62.01h-31.88c-0.48,-2.9 -0.48,-1.93 -0.48,-2.9h33.33C173.12,60.08 173.12,59.6 172.64,62.01z"/>
    <path android:fillColor="#F6BE19" android:pathData="M143.65,63.94h-7.73V56.7h7.73V63.94zM136.89,62.98h6.28v-5.8h-6.28V62.98z"/>
    <path android:fillColor="#F6BE19" android:pathData="M147.04,70.22h-7.73v-7.24h7.73V70.22zM139.79,69.26h6.28v-5.8h-6.28V69.26z"/>
    <path android:fillColor="#F6BE19" android:pathData="M155.73,75.54h-7.73v-7.24h7.73V75.54zM148.48,75.06h6.28v-5.8h-6.28C148.48,68.78 148.48,75.06 148.48,75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M166.36,75.54h-7.73v-7.24h7.73V75.54zM159.11,75.06h6.28v-5.8h-6.28V75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M173.12,69.74h-7.73v-7.25h7.73V69.74zM165.87,68.78h6.28v-5.8h-6.28V68.78z"/>
    <path android:fillColor="#F6BE19" android:pathData="M176.98,63.46h-7.73v-7.24h7.73V63.46zM169.74,62.98h6.28V56.7h-6.28V62.98z"/>
    <path android:fillColor="#F6BE19" android:pathData="M86.18,63.94h-7.73V56.7h7.73V63.94zM78.93,62.98h6.28v-5.8H78.93V62.98z"/>
    <path android:fillColor="#F6BE19" android:pathData="M89.56,70.22h-7.73v-7.24h7.73V70.22zM82.31,69.26h6.28v-5.8h-6.28V69.26z"/>
    <path android:fillColor="#F6BE19" android:pathData="M97.77,75.54H90.04v-7.24h7.73V75.54zM91.01,75.06h6.28v-5.8h-6.28V75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M108.88,75.54h-7.73v-7.24h7.73V75.54zM101.63,75.06h6.28v-5.8h-6.28V75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M115.64,69.74h-7.73v-7.25h7.73V69.74zM108.39,68.78h6.28v-5.8h-6.28V68.78z"/>
    <path android:fillColor="#F6BE19" android:pathData="M119.5,63.46h-7.73v-7.24h7.73V63.46zM112.26,62.98h6.28V56.7h-6.28V62.98z"/>
    <path android:fillColor="#2A2853" android:pathData="M59.64,173.34h5.88v40.64H85v4.94h-25.36V173.34z"/>
    <path android:fillColor="#2A2853" android:pathData="M120.03,202.28c0,12.1 -8.39,17.38 -16.3,17.38c-8.86,0 -15.69,-6.49 -15.69,-16.84c0,-10.95 7.17,-17.38 16.23,-17.38C113.67,185.44 120.03,192.27 120.03,202.28zM94.06,202.62c0,7.17 4.13,12.58 9.94,12.58c5.68,0 9.94,-5.34 9.94,-12.71c0,-5.55 -2.77,-12.58 -9.81,-12.58S94.06,196.4 94.06,202.62z"/>
    <path android:fillColor="#2A2853" android:pathData="M155.73,186.19c-0.14,2.37 -0.27,5.01 -0.27,8.99v19c0,7.51 -1.49,12.1 -4.67,14.94c-3.18,2.98 -7.78,3.92 -11.9,3.92c-3.92,0 -8.25,-0.94 -10.89,-2.7l1.49,-4.53c2.16,1.35 5.55,2.57 9.6,2.57c6.09,0 10.55,-3.18 10.55,-11.43v-3.65h-0.14c-1.83,3.04 -5.34,5.48 -10.41,5.48c-8.11,0 -13.93,-6.9 -13.93,-15.96c0,-11.09 7.24,-17.38 14.74,-17.38c5.68,0 8.79,2.98 10.21,5.68h0.14l0.27,-4.94H155.73zM149.58,199.1c0,-1.02 -0.07,-1.89 -0.34,-2.7c-1.08,-3.45 -3.99,-6.29 -8.32,-6.29c-5.68,0 -9.74,4.8 -9.74,12.38c0,6.42 3.25,11.77 9.67,11.77c3.65,0 6.97,-2.3 8.25,-6.09c0.34,-1.01 0.47,-2.16 0.47,-3.18V199.1z"/>
    <path android:fillColor="#2A2853" android:pathData="M171.55,176.99c0.07,2.03 -1.42,3.65 -3.79,3.65c-2.1,0 -3.59,-1.62 -3.59,-3.65c0,-2.1 1.56,-3.72 3.72,-3.72C170.13,173.27 171.55,174.89 171.55,176.99zM164.93,218.92v-32.73h5.95v32.73H164.93z"/>
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</vector>


I have checked your Svg and there is somthing wrong in your svg. So I recreated svg and imported in my drawable. use this xml directly as drawable. its generated by SVG
 

 
 
ic_smile_new.xml
 

 

<vector android:height="24dp" android:viewportHeight="256.0"
    android:viewportWidth="256.0" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="#2A2853" android:pathData="M125.3,159.6C82.68,159.6 48,124.92 48,82.3C48,39.68 82.68,5 125.3,5s77.3,34.68 77.3,77.3C202.6,124.92 167.92,159.6 125.3,159.6zM125.3,6C83.23,6 49,40.23 49,82.3c0,42.07 34.23,76.3 76.3,76.3c42.07,0 76.3,-34.23 76.3,-76.3C201.6,40.23 167.37,6 125.3,6z"/>
    <path android:fillColor="#2A2853" android:pathData="M102.11,55.73m-12.07,0a12.07,12.07 0,1 1,24.15 0a12.07,12.07 0,1 1,-24.15 0"/>
    <path android:fillColor="#2A2853" android:pathData="M158.63,58.63m-12.07,0a12.07,12.07 0,1 1,24.15 0a12.07,12.07 0,1 1,-24.15 0"/>
    <path android:fillColor="#2A2853" android:pathData="M161.32,109.66c-19.32,19.8 -50.23,19.32 -69.07,-0.48c-2.9,-2.9 -7.24,1.45 -4.35,4.35c21.25,22.22 56.51,22.22 77.77,0.48C168.57,111.11 164.22,106.76 161.32,109.66L161.32,109.66z"/>
    <path android:fillColor="#F6BE19" android:pathData="M183.26,48.97h-1.93c-2.41,-6.76 -10.63,-7.24 -20.29,-7.24c-1.45,0 -2.9,0 -3.86,0c-1.45,0 -2.9,0 -3.87,0c-9.66,0 -17.87,0.48 -20.29,7.24h-8.69c-2.41,-6.76 -10.63,-7.24 -20.29,-7.24c-1.45,0 -2.9,0 -3.86,0c-1.45,0 -2.9,0 -3.86,0c-9.66,0 -17.87,0.48 -20.29,7.24H74.1c-2.9,0 -5.31,2.41 -5.31,5.31c0,2.9 2.41,5.31 5.31,5.31h1.45c2.42,11.59 12.56,20.29 24.63,20.29c12.07,0 22.7,-8.69 24.63,-20.29h7.73c2.42,11.59 12.56,20.29 24.64,20.29c12.07,0 22.7,-8.69 24.63,-20.29h1.45c2.9,0 5.31,-2.41 5.31,-5.31C188.58,51.39 186.16,48.97 183.26,48.97zM111.29,67.33H88.11c-0.48,0 -1.45,0 -1.93,-2.9h26.57C112.26,67.33 111.78,67.33 111.29,67.33zM91.49,70.22h15.46c-2.41,0 -4.83,1.93 -7.73,1.93C96.32,72.16 93.9,70.22 91.49,70.22zM115.16,62.01H83.28c-0.48,-2.9 -0.48,-1.93 -0.48,-2.9h33.33C115.64,60.08 115.64,59.6 115.16,62.01zM168.29,67.33h-23.19c-0.48,0 -1.45,0 -1.93,-2.9h26.57C169.74,67.33 169.26,67.33 168.29,67.33zM148.97,70.22h15.46c-2.41,0 -4.83,1.93 -7.73,1.93C154.28,72.16 151.38,70.22 148.97,70.22zM172.64,62.01h-31.88c-0.48,-2.9 -0.48,-1.93 -0.48,-2.9h33.33C173.12,60.08 173.12,59.6 172.64,62.01z"/>
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    <path android:fillColor="#F6BE19" android:pathData="M173.12,69.74h-7.73v-7.25h7.73V69.74zM165.87,68.78h6.28v-5.8h-6.28V68.78z"/>
    <path android:fillColor="#F6BE19" android:pathData="M176.98,63.46h-7.73v-7.24h7.73V63.46zM169.74,62.98h6.28V56.7h-6.28V62.98z"/>
    <path android:fillColor="#F6BE19" android:pathData="M86.18,63.94h-7.73V56.7h7.73V63.94zM78.93,62.98h6.28v-5.8H78.93V62.98z"/>
    <path android:fillColor="#F6BE19" android:pathData="M89.56,70.22h-7.73v-7.24h7.73V70.22zM82.31,69.26h6.28v-5.8h-6.28V69.26z"/>
    <path android:fillColor="#F6BE19" android:pathData="M97.77,75.54H90.04v-7.24h7.73V75.54zM91.01,75.06h6.28v-5.8h-6.28V75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M108.88,75.54h-7.73v-7.24h7.73V75.54zM101.63,75.06h6.28v-5.8h-6.28V75.06z"/>
    <path android:fillColor="#F6BE19" android:pathData="M115.64,69.74h-7.73v-7.25h7.73V69.74zM108.39,68.78h6.28v-5.8h-6.28V68.78z"/>
    <path android:fillColor="#F6BE19" android:pathData="M119.5,63.46h-7.73v-7.24h7.73V63.46zM112.26,62.98h6.28V56.7h-6.28V62.98z"/>
    <path android:fillColor="#2A2853" android:pathData="M59.64,173.34h5.88v40.64H85v4.94h-25.36V173.34z"/>
    <path android:fillColor="#2A2853" android:pathData="M120.03,202.28c0,12.1 -8.39,17.38 -16.3,17.38c-8.86,0 -15.69,-6.49 -15.69,-16.84c0,-10.95 7.17,-17.38 16.23,-17.38C113.67,185.44 120.03,192.27 120.03,202.28zM94.06,202.62c0,7.17 4.13,12.58 9.94,12.58c5.68,0 9.94,-5.34 9.94,-12.71c0,-5.55 -2.77,-12.58 -9.81,-12.58S94.06,196.4 94.06,202.62z"/>
    <path android:fillColor="#2A2853" android:pathData="M155.73,186.19c-0.14,2.37 -0.27,5.01 -0.27,8.99v19c0,7.51 -1.49,12.1 -4.67,14.94c-3.18,2.98 -7.78,3.92 -11.9,3.92c-3.92,0 -8.25,-0.94 -10.89,-2.7l1.49,-4.53c2.16,1.35 5.55,2.57 9.6,2.57c6.09,0 10.55,-3.18 10.55,-11.43v-3.65h-0.14c-1.83,3.04 -5.34,5.48 -10.41,5.48c-8.11,0 -13.93,-6.9 -13.93,-15.96c0,-11.09 7.24,-17.38 14.74,-17.38c5.68,0 8.79,2.98 10.21,5.68h0.14l0.27,-4.94H155.73zM149.58,199.1c0,-1.02 -0.07,-1.89 -0.34,-2.7c-1.08,-3.45 -3.99,-6.29 -8.32,-6.29c-5.68,0 -9.74,4.8 -9.74,12.38c0,6.42 3.25,11.77 9.67,11.77c3.65,0 6.97,-2.3 8.25,-6.09c0.34,-1.01 0.47,-2.16 0.47,-3.18V199.1z"/>
    <path android:fillColor="#2A2853" android:pathData="M171.55,176.99c0.07,2.03 -1.42,3.65 -3.79,3.65c-2.1,0 -3.59,-1.62 -3.59,-3.65c0,-2.1 1.56,-3.72 3.72,-3.72C170.13,173.27 171.55,174.89 171.55,176.99zM164.93,218.92v-32.73h5.95v32.73H164.93z"/>
    <path android:fillColor="#2A2853" android:pathData="M180.75,195.04c0,-3.38 -0.07,-6.15 -0.27,-8.86h5.28l0.34,5.41h0.14c1.62,-3.11 5.41,-6.15 10.82,-6.15c4.53,0 11.56,2.7 11.56,13.93v19.55h-5.95v-18.87c0,-5.27 -1.96,-9.67 -7.57,-9.67c-3.92,0 -6.97,2.77 -7.98,6.09c-0.27,0.74 -0.41,1.76 -0.41,2.77v19.68h-5.95V195.04z"/>
</vector>

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    我试图将相同的图标导入空项目，我看到了与您相同的行为。 如果您单击开启/关闭小“覆盖”按钮，它似乎可以解决问题，如果只是暂时的。 下面的XML为我显示了正确的颜色，试着直接将它粘贴到当前文件中：

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    第1步。首先尝试清理并重新启动项目，看看它是否适合你。 在大多数情况下，它会解决你的问题。 第2步。如果这对您没有影响，那意味着您必须启用MultiDex模式。 适用于Android 5.0和更高版本的Multidex支持 Android 5.0及更高版本使用称为ART的运行时，它本身支持从应用程序APK文件加载多个dex文件。 ART在应用程序安装时执行预编译，扫描类（.. N）.dex文件并将它们编译为一个.oat文件供Android设备执行。 有关Android 5.0运行时的更多信息，请参阅介绍AR ...

  • 矢量在android工作室中集合(Vector assests in android studio)[2022-08-08]

    运行时不能更改单个路径的颜色。 但是你可以用setTint改变整个矢量的颜色。

    如何反转（负）Android矢量图像（路径）(How to Invert (Negative) Android Vector Image (Path))[2023-07-15]

    感谢@pskink - 根据他的建议我使用了 myImageView.setColorFilter(Color.WHITE, PorterDuff.Mode.XOR); myStateListDrawable.addState(new int[] { android.R.attr.state_checked }, myImageView); 为了达到我的需求。 向下滚动下面的链接 - 使用ColorFilter的其他选项可以轻松理解示例 https://android--examples.blogspo ...

  • 将Vector资源导入Android Studio时出错(Error importing Vector Asset into Android Studio)[2022-02-02]

    在将png转换为svg时，我们需要遵循一些规则。 所有转换器都不能正常工作。 在我的情况下，我找到了最好的转换器网站，它会给你预览图像，以确认在转换过程中，这将要求免费注册，然后你可以下载你的svg文件。 将PNG转换为SVG - 这需要单一注册，每天只能通过一封电子邮件发送2个令牌 替代品： 参考2 参考3 生成svg后，使用以下工具将svg转换为矢量可绘制（这是必要的，因为不知何故，android studio无法导入随机转换器生成的所有格式和样式） 从SVG生成矢量绘制 我为你的图像做了上述步骤。 我 ...

  • 在android studio中使用彩色的矢量图像(use coloured vector image in android studio)[2023-01-08]

    我检查了您的Svg，并且您的svg中有错误。 所以我重新创建了svg并导入到我的drawable中。 直接使用这个xml作为drawable。 它由SVG生成 ic_smile_new.xml

    为什么Android Asset Studio会剪切我的矢量图像？(Why does Android Asset Studio cut my vector images?)[2021-10-21]

    这似乎是由于Android Studio SVG导入功能中的错误。 它没有正确地转换SVG中的元素。 看看下面的例子。 SVG的原始元素呈绿色。 我已经将VectorDrawable中的路径元素转换回SVG路径，并将它们覆盖在原始SVG上。 你可以看到红色的圆形路径（来自VectorDrawable）与原始的SVG不匹配。 ...

  • 如何使用矢量图像的不同Android屏幕尺寸(how to use vector images for different android screen sizes)[2022-03-12]

    你缩放的意思是什么？ 也许你是误解。 如果你的意思是图像大小会在各种屏幕尺寸中改变，这样的事情就不会发生。 图像大小是您在imageview（或使用该图像的任何其他视图）中提供的。 矢量资产和普通资产之间唯一不同的是，每次都会重新绘制矢量资产，因此无论图像质量有多大以及显示哪个设备，您都不会拥有低质量图像。因此您无需保存各种尺寸的图像适用于各种尺寸的屏幕。 如果要更改图像的大小，只需更改imageView的高度和宽度即可。 你可以使用dp（密度独立）单位。 what you mean by being sc ...

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