C# reflection getproperties propertyinfo

如何从 PropertyInfo 访问对象的属性？

发布于 2024-11-27 18:17:04 字数 523 浏览 4 评论 0原文

当我遍历对象的属性并最终得到 PropertyInfo 时，如何访问该对象的实际属性？

@foreach(var propertyInfo in Model.Entity.GetType().GetProperties()) {
    if (propertyInfo.PropertyType != typeof(string) &&
        propertyInfo.PropertyType.GetInterface(typeof(IEnumerable<>).Name) != null) {
        <div>
            @foreach(var item in propertyInfo/*Need Actual Property Here*/) {
                @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
            }
        </div>;
    }
}

原文

When I foreach through an object's properties and end up with a PropertyInfo, how can I access the actual property of the object?

@foreach(var propertyInfo in Model.Entity.GetType().GetProperties()) {
    if (propertyInfo.PropertyType != typeof(string) &&
        propertyInfo.PropertyType.GetInterface(typeof(IEnumerable<>).Name) != null) {
        <div>
            @foreach(var item in propertyInfo/*Need Actual Property Here*/) {
                @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
            }
        </div>;
    }
}

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我爱人 2024-12-04 18:17:04

好吧，您需要一个实例来调用它 - 在本例中大概是 Model.Entity 。您需要GetValue 方法。但是，这将非常棘手 - 因为您需要两件事：

您需要可以通过 foreach 迭代该值
您需要每个 item 有一个 Id< /代码> 属性。

如果您使用 C# 4 和 .NET 4，则可以使用动态类型使其变得更简单：

IEnumerable values = (IEnumerable) propertyInfo.GetValue(Model.Entity, null);
@foreach(dynamic item in values) {
    @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
}

甚至：

dynamic values = propertyInfo.GetValue(Model.Entity, null);
@foreach(dynamic item in values) {
    @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
}

Well, you need an instance to call it on - presumably that's Model.Entity in this case. You need the GetValue method. However, it's going to be quite tricky - because you need two things:

You need the value to be iterable by foreach
You need each item to have an Id property.

If you're using C# 4 and .NET 4, you can use dynamic typing to make it a bit simpler:

IEnumerable values = (IEnumerable) propertyInfo.GetValue(Model.Entity, null);
@foreach(dynamic item in values) {
    @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
}

Or even:

dynamic values = propertyInfo.GetValue(Model.Entity, null);
@foreach(dynamic item in values) {
    @Html.Action("Edit", new { Id = item.Id, typeName = "Item" });
}

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海的爱人是光 2024-12-04 18:17:04

当您说获取“对象的实际属性”时，如果您指的是属性的值，那么您可以执行如下操作。

var item = in propertyInfo.GetValue(Model.Entity, null);

但是，如果您没有解析正确的类型（在上面的示例中应该是使用 var 进行推理的对象），您将无法访问的 Id 属性无需进一步反映或访问数据的不同动态方法的值。

编辑：将示例修改为不在 foreach 中，因为 @Jon Skeet 指出，如果没有强制转换，它就无法编译，而且这也是为了演示从 PropertyInfo 中检索值

When you say get the "actual property of the object" if you are referring to the value of the property then you can do something like below.

var item = in propertyInfo.GetValue(Model.Entity, null);

However if you don't have the proper type resolved (which should be object in the above example using var for inference) you will not be able to access the Id property of the value without further reflection or a different dynamic method for accessing the data.

Edit: modified the example not to be in the foreach as @Jon Skeet pointed out it wouldn't compile without the cast and this is moreover to demonstrate retrieving a value from PropertyInfo

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