Partial Method Example

A tutorial example is provided on how to write the partial method definition in one partial class and the partial method signature in other partial classes.

To verify our understanding of partial methods, let's rewrite the MyWindow class from two partial classes presented in the previous tutorial with partial methods:

The first partial class in the first source file, PartialMethod1.cs, includes partial method signatures of two event handler methods:

// PartialMethod2.cs
// Copyright (c) 2015 by Dr. Herong Yang, herongyang.com

using System.Windows;
using System.Windows.Controls;
public partial class MyWindow : Window {
   private Label myLabel;
   public MyWindow() {
      Width = 200;
      Height = 200;
      Title = "WPF Button Test";

      Grid myGrid = new Grid();
      Content = myGrid;
      
      Button yesButton = new Button();
      yesButton.Content = "Yes";
      yesButton.Margin = new Thickness(50, 10, 50, 0);
      yesButton.Height = 30;
      yesButton.VerticalAlignment = 
         System.Windows.VerticalAlignment.Top;
      yesButton.Click += new RoutedEventHandler(yesButton_Click);
      myGrid.Children.Add(yesButton);

      Button noButton = new Button();
      noButton.Content = "No";
      noButton.Margin = new Thickness(50, 50, 50, 0);
      noButton.Height = 30;
      noButton.VerticalAlignment = 
         System.Windows.VerticalAlignment.Top;
      noButton.Click += new RoutedEventHandler(noButton_Click);
      myGrid.Children.Add(noButton);
      
      myLabel = new Label();
      myLabel.Margin = new Thickness(50,90,50,0);
      myGrid.Children.Add(myLabel);
   }
   
   partial void yesButton_Click(object sender, RoutedEventArgs e);
   partial void noButton_Click(object sender, RoutedEventArgs e);
}

The second partial class in the second source file, PartialMethod2.cs, includes partial method definitions of two event handler methods:

// PartialMethod2.cs
// Copyright (c) 2015 by Dr. Herong Yang, herongyang.com

using System.Windows;
using System.Windows.Controls;
public partial class MyWindow : Window {

   partial void yesButton_Click(object sender, RoutedEventArgs e) {
      myLabel.Content = "Yes clicked";
   }
   partial void noButton_Click(object sender, RoutedEventArgs e) {
      myLabel.Content = "No clicked";
   }

   [System.STAThread]
   public static void Main() {
      Application app = new Application();
      app.Run(new MyWindow());
   }
}

The MSBuild project file, PartialMethod.proj, is shown below:

<!-- PartialMethod.proj
// Copyright (c) 2015 by Dr. Herong Yang, herongyang.com
-->
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
     <AssemblyName>PartialMethod</AssemblyName>
     <NET>C:\windows\Microsoft.NET\Framework\v4.0.30319</NET>
     <REF1>C:\Program Files\Reference Assemblies</REF1>
     <REF2>\Microsoft\Framework\.NETFramework\v4.6.1</REF2>
     <REF>$(REF1)$(REF2)</REF>
  </PropertyGroup>
  <ItemGroup>
    <Compile Include="PartialMethod1.cs" />
    <Compile Include="PartialMethod2.cs" />
    <Reference Include="$(REF)\PresentationFramework.dll" />
    <Reference Include="$(REF)\PresentationCore.dll" />
    <Reference Include="$(REF)\System.Xaml.dll" />
    <Reference Include="$(REF)\WindowsBase.dll" />
  </ItemGroup>
  <Target Name="Build">
    <Csc ToolPath="$(NET)" Sources="@(Compile)" 
       References="@(Reference)"
       OutputAssembly="$(AssemblyName).exe"/>  
  </Target>
</Project>

Run "msbuild", we will get the executable program file, PartialMethod.exe.

Last update: 2015.

Table of Contents

 About This Book

 Introduction of C# (C Sharp)

 Data Type and Variables

 Logical Expressions and Conditional Statements

 Arrays and Loop Statements

 Data Type Features

 Floating-Point Data Types

 Passing Parameters to Methods

 Execution Environment Class

 Visual C# 2010 Express Edition

 Class Features

 C# Compiler and Intermediate Language

 Compiling C# Source Code Files

 MSBuild - Microsoft Build Engine

 Memory Usages of Processes

 Multithreading in C#

 Async Feature from C# 5

 System.IO.FileInfo Class

 System.Diagnostics.FileVersionInfo Class

 WPF - Windows Presentation Foundation

Partial Classes and Partial Methods

 What Is Partial Class?

 Partial Class Example

 What Is Partial Method?

Partial Method Example

 Outdated Tutorials

 References

 PDF Printing Version