如果控件具有属性，则更改控件的属性值

Question

Some controls on my form have a DataSource property on the control itself, some dont.

I want to loop through all the controls and set the DataSource to Nothing if the control has the property. It would work something like this.

Private Sub ClearAllDatabindings()
    If _dataBindingsSet = True Then
        For Each ctrl As Control In Me.Controls
            ClearDataBindings(ctrl)
            SetDatasourceToNothing(ctrl) '-- This is the piece idk how to Write.
        Next
    End If
End Sub

I am not sure how to check this during run-time.

Answer 1

As requested by OP, In C#, using System.Reflection, you could do something like this to check if a class / its instance has property or not:

//for class type
var props = typeof(MyClass).GetProperties();
if (props == null || props.Length <= 0) { //does not have property
     //do something
}

//for class instance
var props = classInstance.GetType().GetProperties();
if (props == null || props.Length <= 0) { //does not have property
     //do something
}

To check for specific property:

 var prop = props.SingleOrDefault(x => x.Name == "propName");
 if(prop != null){
     //has that property
     //do changing of your Control here
 }