asp.net mvc 3 中 DataAnnotations 的行为是否发生了变化？

发布于 2024-12-05 12:30:33 字数 409 浏览 2 评论 0原文

有一个带有属性的模型，

[ReadOnly(true)]
public decimal BodyMassIndex { get; private set; }

我的视图中

@Html.EditorForModel()

当我调用时，我仍然会得到该属性的标准可编辑文本框，

这是为什么？如果文本框仍然可编辑，那么这个 DataAnnotation 属性的意义何在？

Brad Wilson 的帖子

原文

I have a Model with a property

[ReadOnly(true)]
public decimal BodyMassIndex { get; private set; }

In my View when I call

@Html.EditorForModel()

I still get a standard editable textbox for that property

Why is this? if the textbox is still editable whats the point of this DataAnnotation Attibute?

Brad Wilson's post

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美人如玉 2024-12-12 12:30:33

这不是 DataAnnotation 属性。请注意，它位于 System.ComponentModel 命名空间中。数据注释位于System.ComponentModel.DataAnnotations命名空间中。

然而，这是我们可以考虑支持的情况。但您究竟期望发生什么以及为什么要这样？

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九厘米的零° 2024-12-12 12:30:33

你可以使用

@Html.TextBoxFor(x=> x.ModelProperty, new { @readonly="readonly"})

you can use

@Html.TextBoxFor(x=> x.ModelProperty, new { @readonly="readonly"})

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作死小能手 2024-12-12 12:30:33

根据我对您的问题和对其他答案的评论的理解，您只是想显示 BodyMassIndex，而不是使其可编辑。

如果是这种情况，请使用 @Html.DisplayFor 而不是 @Html.EditorFor。

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孤凫 2024-12-12 12:30:33

AFAIK ReadOnlyAttribute 用于类的属性。来自 MSDN

 Members that are marked with the ReadOnlyAttribute set to true or that do not have a Set method 
 cannot be changed. Members that do not have this attribute or that are marked with the 
 ReadOnlyAttribute set to false are read/write, and they can be changed. The default is No.

因此，您可以在类中使用它来防止对属性的修改。（至少是我赋予该属性的含义）

如果您想要一个只读文本框，请使用类似的内容，

 @Html.TextBox("MyText", "my text", new { @readonly="readonly" })

只读的@第一个告诉编译器绕过保留字

AFAIK the ReadOnlyAttribute is for property of class. From MSDN

 Members that are marked with the ReadOnlyAttribute set to true or that do not have a Set method 
 cannot be changed. Members that do not have this attribute or that are marked with the 
 ReadOnlyAttribute set to false are read/write, and they can be changed. The default is No.

So you use this inside your classes to prevent modification to the properties. (at least the meaning I give to that attribute)

If you want a textbox readonly use something like that

 @Html.TextBox("MyText", "my text", new { @readonly="readonly" })

the @ first of readonly tell the compiler to bybass the reserved word

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煞人兵器 2024-12-12 12:30:33

这适用于带有 Bootstrap 3 的 Vs2013 C#。

            <div class="form-group">
                @Html.LabelFor(model => model.PasswordHash, htmlAttributes: new { @class = "control-label col-md-3" })
                <div class="col-md-6">
                    @Html.EditorFor(model => model.PasswordHash, new { htmlAttributes = new { @class = "form-control", @readonly="readonly" } })
                    @Html.ValidationMessageFor(model => model.PasswordHash, "", new { @class = "text-danger" })
                </div>
            </div>

This works in Vs2013 C# with Bootstrap 3.

            <div class="form-group">
                @Html.LabelFor(model => model.PasswordHash, htmlAttributes: new { @class = "control-label col-md-3" })
                <div class="col-md-6">
                    @Html.EditorFor(model => model.PasswordHash, new { htmlAttributes = new { @class = "form-control", @readonly="readonly" } })
                    @Html.ValidationMessageFor(model => model.PasswordHash, "", new { @class = "text-danger" })
                </div>
            </div>

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