VS Designer总是抛出异常“x属性没有get / set方法”

Question

I'm having this problem with the VS Designer that makes it impossible to work with it. What it happens is that I'm editing my XAML code, and the VS Designer will throw an exception at some point, with a StackTrace like this:

InvalidOperationException: The Property "MyObject.MyProperty" doesn't have a get method

StackTrace:

at Microsoft.Expression.DesignModel.Metadata.LocalClrPropertyImplementation.GetValue(Object target) at Microsoft.Expression.DesignModel.Metadata.ClrPropertyReferenceStep.GetValue(Object valueToInspect) at Microsoft.Expression.DesignModel.Metadata.PropertyReference.TryGetValue(Object& value, ReferenceStep referenceStep, Object target) at Microsoft.Expression.DesignModel.Metadata.PropertyReference.PartialGetValue(Object target, Int32 initialStepIndex, Int32 finalStepIndex) at [...]

...and it goes on for another 50 lines at least.

The Property in question is something like this:

private bool _MyProperty = true;

public bool MyProperty
{
    set
    {
        if (_MyProperty != value)
        {
            // Do a few things here
            this._MyProperty = value;
        }
    }
}

Now, this works fine, and I have dozens of things like this in my project, VS has never bothered me with them before. If I try to close and open VS again it will let me work for a while, and then it will eventually start throwing this errors again.

I tried cleaning the Solution from Compile > Clean Solution, it doesn't work.

I really don't know what's the problem here. I mean, I created that property like 2 months ago, why is VS only telling me that now?

Is there a fix for this, or do I have to manually add all those useless get/set methods in every single parameter I have created?

Answer 1

我认为很明显，根据你的错误信息：“属性”MyObject.MyProperty“没有get方法”，你必须通过访问MyObject.MyProperty某处使用MyProperty，你需要检查一下，还有一个方法是，如果你不想在这个类之外公开MyProperty，你应该使用'私人套装'，你有一个公共二传手，你真的很奇怪你没有吸气，希望可以给你一些帮助

Answer 2

I have experienced windows forms designer faults (VS 2015) using write only properties (defined as write only). I could only get the form back on display by making the property read write (set/get).

The only reason I didn't turn this into a method was that I needed is "settable" at design time.

Hope this helps someone - or me when I forget and find this post again :)