对于布尔MVC DropDownListFor默认值 [英] MVC DropDownListFor default value for bool

问题描述

我有真/假值的dropdownlistfor。我想要的默认值是真实的。现在它是假的，因为布尔的默认值是假的。此下拉有时候会在JavaScript动态创建的，因此被传递之前，我不能在模型中设置的值。如何将默认设置为True在CHTML文件？

感谢您。

  // ---------- CSHTML文件---------------
...
   ＆LT; TD类=valuebool＆GT;
        @ Html.DropDownListFor（M = GT; m.IsBoolFilterCondition，
        新的SelectList（
            新[]
            {
                //下面两行默认为false
                //新的{值=真，文本=真}，
                //新的{值=假，文本=FALSE}，                //接下来的两行也默认为false
                //新SelectListItem {值=真，文本=真，选择= TRUE}，
                //新SelectListItem {值=假，文本=FALSE，选择= FALSE}，                //下面两行也默认为false
                新{值=真，文本=真，选择= TRUE}，
                新{值=假，文本=FALSE，选择= FALSE}，
            }，
            值，
            文本
            ）
            新{@类=valuebool}
        ）
...// -------模型类------------------------
公共类FilterCondition中
{
      ...
      公共BOOL IsBoolFilterCondition {搞定;组; }
      ...
}
 

// ---------------浏览器源-----------------------    真正
    假

解决方案

  @ Html.DropDownListFor（M = GT; m.IsBoolFilterCondition，
        新的SelectList（
            新[]
            {
                新SelectListItem {值=1，文本=真，选择= TRUE}，
                新SelectListItem {值=0，文本=FALSE}，
            }，
            值，
            文本
            ）
            新{@类=valuebool}
        ）
 

I have a dropdownlistfor with True/False values. I want the default value to be true. Right now it's false because the default of a bool is false. This dropdown sometimes gets created dynamically in javascript so I can't set the value in the model before it gets passed. How do I set the default to True in the chtml file?

Thank you.

//----------  cshtml file ---------------
...
   <td class="valuebool">
        @Html.DropDownListFor(m => m.IsBoolFilterCondition, 
        new SelectList(
            new[]
            {
                // The following two lines defaulted to false
                //new { Value = "true", Text = "True" },
                //new { Value = "false", Text = "False" },

                // The next two lines also defaulted to false
                //new SelectListItem { Value = "true", Text = "True", Selected = true },
                //new SelectListItem { Value = "false", Text = "False", Selected = false },

                // The following two lines also default to false
                new { Value = "true", Text = "True", Selected = true },
                new { Value = "false", Text = "False", Selected = false },                    
            },
            "Value",
            "Text"
            ),
            new { @class="valuebool"}
        )
...

//------- Model Class ------------------------
public class FilterCondition
{
      ...
      public bool IsBoolFilterCondition { get; set; }
      ...
}

//--------------- Browser Source ----------------------- True False

解决方案

@Html.DropDownListFor(m => m.IsBoolFilterCondition, 
        new SelectList(
            new[]
            {
                new SelectListItem { Value = "1", Text = "True" ,Selected = true},
                new SelectListItem { Value = "0", Text = "False" },
            },
            "Value",
            "Text"
            ),
            new { @class="valuebool"}
        )

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