Question

I’ve been messing around with the answer given here
How to update the GUI from another thread in C#?

I’m getting the error Method ‘System.Windows.Forms.Label’ Text not found from the following code

Private Delegate Sub setControlPropertyThreadSafeDelegate(control As Control, propertyName As String, propertyValue As Object)

Public Sub setControlPropertyThreadSafe(control As Control, propertyName As String, propertyValue As Object)
    If control.InvokeRequired = True Then
        control.Invoke(New setControlPropertyThreadSafeDelegate(AddressOf setControlPropertyThreadSafe), New Object() {control, propertyName, propertyValue})
    Else
        control.GetType().InvokeMember(propertyName, Reflection.BindingFlags.SetProperty, Nothing, control, New Object() {control, propertyName, propertyValue}) 'This is where the error occurs
    End If
End Sub

From a separate thread I calling this method with the following line

UI.setControlPropertyThreadSafe(UI.lblExcel, "Text", "Inserting Data into YTD Template")

Any help regarding this error will be much appreciated.

Answer 1

The line

control.GetType().InvokeMember(propertyName, Reflection.BindingFlags.SetProperty, _
    Nothing, control, New Object() {control, propertyName, propertyValue})

Should be

control.GetType().InvokeMember(propertyName, Reflection.BindingFlags.SetProperty, _
    Nothing, control, New Object() {propertyValue})

The last parameter to InvokeMember is the parameter list for the method, which for a property setting is just the value you wish to set. The question you linked to has it correct.