Cannot bind to the target method because its signature is not compatible with that of the delegate type.

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C#

WPF

Hello All,

ran into a snag that i have never ran into before,

so i am trying to talk between multiple view models and have the current stuff that is being edited displayed on the screen that i managed to setup,

the issue i have is the binding to the string property i created telling me it cant bind to it due to the signature not being accepted

what i have

ViewModelBase Class

public static event EventHandler<string> MyStaticPropertyChanged;

private static string _myStaticProperty;
public static string MyStaticProperty
{
    get { return _myStaticProperty; }
    set
    {
        _myStaticProperty = value;
        MyStaticPropertyChanged?.Invoke(null, value);
    }
}

this is just a place holder that is why i named it my static property ,

in PumpModelViewModel

public  void UpdatePumpState(PumpStateModel updatedPumpState)
{
    //var index = Pumps.IndexOf(updatedPumpState);
    //if (index >= 0)
    //{
    //    Pumps[index] = updatedPumpState;
    //}

    // test to see if i can update the database with mvvm patterne

    // lets call the update methord
    try
    {
        OnStringUpdated(null, "Test String");
        StringUpdatedEvent.RaiseStringUpdated(ViewModelBase.MyStaticProperty);
        pumpstatemodel.savepump(updatedPumpState);
    }
    catch(Exception ex)
    {
        MessageBox.Show("Error 12 Found In UpdatePumpState " +  ex.Message);
    }

}

the on string updated method,

private void OnStringUpdated(object sender, string updatedString)
{
   ViewModelBase.MyStaticProperty = updatedString;
}

then in the MainViewModel


in the constuctor,

ViewModelBase.MyStaticPropertyChanged += OnMyStaticPropertyChanged;

private void OnMyStaticPropertyChanged(object sender, string e)
{
    OnPropertyChanged(nameof(MyStaticProperty));
}

public string MyStaticProperty
{
    get { return ViewModelBase.MyStaticProperty; }
    set { ViewModelBase.MyStaticProperty = value; }
}

then i bind to the above MyStaticPropery and i get the following error ,

Cannot bind to the target method because its signature is not compatible with that of the delegate type.


any help would be much appreciated.

What I have tried:

Searched on internet and other forms but not able to find a resolve for this issue.