C#•4mo ago

WPF TextBlock Text binding

Hello i am working with wpf for very first time. I am trying to make a textbox with placeholder but when i try to use this resource it says The member "Placeholder" is not recognized or is not accessible. Here is my code

PlaceholderTextbox.xaml
<Grid>
    <TextBlock 
        x:Name="txtPlaceholder" 
        VerticalAlignment="Center"
        HorizontalAlignment="Left"
        FontSize="16"
        Padding="10,0,0,0"
        Foreground="#a3a3a4"
        Text="{Binding Placeholder}"
        />
</Grid>

PlaceholderTextbox.xaml
<Grid>
    <TextBlock 
        x:Name="txtPlaceholder" 
        VerticalAlignment="Center"
        HorizontalAlignment="Left"
        FontSize="16"
        Padding="10,0,0,0"
        Foreground="#a3a3a4"
        Text="{Binding Placeholder}"
        />
</Grid>

PlaceholderTextbox.xaml.cs
        public PlaceholderTextbox()
        {
            InitializeComponent();
            DataContext = new CustomTextboxViewmodel();
        }

PlaceholderTextbox.xaml.cs
        public PlaceholderTextbox()
        {
            InitializeComponent();
            DataContext = new CustomTextboxViewmodel();
        }

PlaceholderTextboxVM.cs
    class CustomTextboxViewmodel : Base
    {
        private string placeholder = "Placeholder";

        public string Placeholder
        {
            get { return placeholder; }
            set { placeholder = value; OnPropertyChanged(); }
        }
    }

PlaceholderTextboxVM.cs
    class CustomTextboxViewmodel : Base
    {
        private string placeholder = "Placeholder";

        public string Placeholder
        {
            get { return placeholder; }
            set { placeholder = value; OnPropertyChanged(); }
        }
    }

13 Replies

constantine•4mo ago

Try to make your view model class public

quantum•4mo ago

Yeah i have tried that but still same

constantine•4mo ago

When are you getting the mentioned error message? Upon the compilation? Because usually even if there are binding issues, it still compiles and runs.

quantum•4mo ago

Yeah i got that error on compilation

constantine•4mo ago

Did you try to run “clean solution”?

quantum•4mo ago

No i didnt let me try now it is same and more

quantum•4mo ago

quantum•4mo ago

I have removed bin and obj folder and now my errors are these only

constantine•4mo ago

You see now? It looks for the Placeholder property in the TextboxPlaceholder class, not in the view model. This means that data context is not set properly. Try to put a breakpoint at the constructor of the TextboxPlaceholder. Does it been called? Also it could be helpful if you share your solution on GitHub or somewhere, the devil may hide in other details.

quantum•4mo ago

Actually i have changed the viewmodel class name while i am trying solutions at the end i couldnt find any solutions and i have completely removed the viewmodel class i am doing things in directly on PlaceholderTextbox.xaml.cs now it works for sure and i have lost more than one day on here for looking solutions so i stopped looking for solution

quantum•4mo ago

PlaceholderTextboxVM.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace WpfApp2.ViewModels
{
    internal class PlaceholderTextboxVM : INotifyPropertyChanged
    {
        #region Properties
        private string placeholder = "Placeholder";

        public string Placeholder
        {
            get { return placeholder; }
            set { placeholder = value; OnPropertyChanged(); }
        }

        private string text = "";

        public string Text
        {
            get { return text; }
            set { text = value; OnPropertyChanged(); }
        }

        private bool isclearable = false;

        public bool IsClearable
        {
            get { return isclearable; }
            set { isclearable = value; OnPropertyChanged(); }
        }

        private bool ispassword;

        public bool IsPassword
        {
            get { return ispassword; }
            set { ispassword = value; OnPropertyChanged(); }
        }
        #endregion

        public event PropertyChangedEventHandler? PropertyChanged = null;

        protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace WpfApp2.ViewModels
{
    internal class PlaceholderTextboxVM : INotifyPropertyChanged
    {
        #region Properties
        private string placeholder = "Placeholder";

        public string Placeholder
        {
            get { return placeholder; }
            set { placeholder = value; OnPropertyChanged(); }
        }

        private string text = "";

        public string Text
        {
            get { return text; }
            set { text = value; OnPropertyChanged(); }
        }

        private bool isclearable = false;

        public bool IsClearable
        {
            get { return isclearable; }
            set { isclearable = value; OnPropertyChanged(); }
        }

        private bool ispassword;

        public bool IsPassword
        {
            get { return ispassword; }
            set { ispassword = value; OnPropertyChanged(); }
        }
        #endregion

        public event PropertyChangedEventHandler? PropertyChanged = null;

        protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

you can check these if you want but it still same i cannot build while i am using this properties

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WPF TextBlock Text binding