Add parameter to Button click event

问题

I have a wpf button like this:

<Button Click="button1_Click" Height="23" Margin="0,0,5,0" Name="button1" Width="75">Initiate</Button>

And I want to pass {Binding Code} passed as parameter to the button1_click handler.
How do I go about this?

Disclaimer: really new to WPF

回答1:

Simple solution:

<Button Tag="{Binding Code}" ...>

In your handler, cast the sender object to Button and access the Tag property:

var myValue = ((Button)sender).Tag;

A more elegant solution would be to use the Command pattern of WPF: Create a Command for the functionality you want the button to perform, bind the Command to the Button's Command property and bind the CommandParameter to your value.

回答2:

I'm not overly a fan of 'Tag' so perhaps

<Button Click="button1_Click" myParam="parameter1" Height="23" Margin="0,0,5,0" Name="button1" Width="75">Initiate</Button>

Then accessing via the Attributes.

 void button1_Click(object sender, RoutedEventArgs e)
 {
    var button = sender as Button;
    var theValue = button.Attributes["myParam"].ToString()
 }

回答3:

Well there are two ways of doing this:

Cast the DataContext

 void button1_Click(object sender, RoutedEventArgs e)
 {
    var button = sender as Button;
    var code = ((Coupon)button.DataContext).Code;
 }

Or use the Tag property which is a generic state property

 <Button Click="button1_Click" Height="23" Margin="0,0,5,0" Name="button1" Tag="{Binding Code}" />

then

void button1_Click(object sender, RoutedEventArgs e)
{
    var button = sender as Button;
    var code = button.Tag;
}

回答4:

Using Xaml and DataContext

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:DataAndCloudServices"
             x:Class="DataAndCloudServices.MainPage" >

    <StackLayout>
        <!-- Command Implemented In Code Behing -->
        <Button Text="Consuming Web Services Samples" 
                Command="{Binding NavigateCommand}" 
                CommandParameter="{x:Type local:YourPageTypeHere}" >

        </Button>
    </StackLayout>
</ContentPage>

And MainPage Code Behing, this code example is to navigate to another page using the page type as argument, you need to make "YourPageTypeHere" and reference page here.

Then implement code Behind.

using System;
using System.Windows.Input;
using Xamarin.Forms;

namespace DataAndCloudServices
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();

            NavigateCommand = new Command<Type>(
              async (Type pageType) =>
              {
                  Page page = (Page)Activator.CreateInstance(pageType);
                  await Navigation.PushAsync(page);
              });

            this.BindingContext = this;
        }
        public ICommand NavigateCommand { private set; get; }
    }
}

Also in your App class need a Instance of NavigationPage in MainPage to Navigate (For this example)

public App ()
        {
            InitializeComponent();

            MainPage = new NavigationPage(new MainPage());
        }

It is for xamarin forms, But It is similar for WPF Projects.

Command could be changed with for WPF and Xamarin: "https://stackoverflow.com/a/47887715/8210755"

来源：https://stackoverflow.com/questions/2006507/add-parameter-to-button-click-event

标签

wpf

.net-3.5

button

click