Question

I defined an ICommand-Class ReadPersons which reads all person objects from the database with a particular where-clause.

The command is being executed trough pressing a button and the where-clause is being insert in a textbox.

Question: How can i pass the text from the textbox to the Execute-Command?

MainWindow.xaml:

    <Button Command="{Binding ReadPersons}">Read persons</Button>
    <TextBox Name="textBoxWhereClause" />

ReadPersons.cs:

    public void Execute(object parameter)
    {
        // Read all persons with my where-clause
        string whereClause = ??? //todo
    }

Answer 1

Yes you can.

<Button Command="{Binding ReadPersons}" 
        CommandParameter="{Binding Text, ElementName=textBoxWhereClause}">
           Read persons</Button>