[英]C# (WPF) methods calling from different classses
我對編碼非常陌生。 當涉及輸入變量時,將方法從B調用到類A時遇到問題。 請解釋為什么a.PrintAfromB(); 給我0值 如何克服這種情況。 我看到一些使用MVVM的示例。 但是在現階段,這些對我來說非常復雜。 好像我得到輸入變量不正確或調用方法不正確。 我很累,無法解決這個問題就無法前進。
主要
public partial class MainWindow : Window {
public MainWindow(){
InitializeComponent();
this.DataContext = this;
}
B b = new B();
A a = new A();
private void Button_Click(object sender, RoutedEventArgs e) {
b.Bat = double.Parse(one.Text);
b.PrintB();
a.PrintAfromB();
a.PrintAfromBB();
}
}
一種
class A
{
double Apple { get; set; }
B b1 = new B();
public void PrintAfromB() {
Console.WriteLine("Calling method from B where input involved: "+b1.CallB());
}
public void PrintAfromBB() {
Console.WriteLine("Calling method from B where input not involved: " + b1.CallBB());
}
}
乙
public class B{
public double Bat { get; set; }
public double k = 0;
public void PrintB(){
k = Bat;
Console.WriteLine("test input value" +k);
}
public double CallB(){
return 10 * Bat;
}
public double CallBB(){
return 10 * 10;
}
}
XAML
<Window x:Class="inputtest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:inputtest"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBlock HorizontalAlignment="Left" Margin="62,141,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top"/>
<TextBox x:Name="one" HorizontalAlignment="Left" Height="23" Margin="198,134,0,0" TextWrapping="Wrap" Text="10" VerticalAlignment="Top" Width="120"/>
<Button Content="Button" HorizontalAlignment="Left" Margin="380,263,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
</Grid>
問題在於,A類的另一個實例B與Main中的實例不同。
要使A打印輸入的內容,應將B實例放入A。
因此,使A如下所示:
class A
{
B b1;
public A(B b){
b1 = b;
}
double Apple { get; set; }
public void PrintAfromB() {
Console.WriteLine("Calling method from B where input involved: "+ b1.CallB());
}
public void PrintAfromBB() {
Console.WriteLine("Calling method from B where input not involved: " + b1.CallBB());
}
}
然后像下面這樣更改Main:
public partial class MainWindow : Window {
public MainWindow(){
InitializeComponent();
this.DataContext = this;
}
B b = new B();
A a = new A(b);
private void Button_Click(object sender, RoutedEventArgs e) {
b.Bat = double.Parse(one.Text);
b.PrintB();
a.PrintAfromB();
a.PrintAfromBB();
}
}
希望能幫助到你。
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