Question

我试图在另一个窗口或多个窗口中访问成员值。这只能用静态变量吗？我有两个WPF Windows。 MainWindow 和 TargetWindow 。

以下是一个例子：

会员类：

 class Variables
    {
        private string _userInput;

        public Variables(string input)
        {
            _userInput = input;
        }

        public string UserInput
        {
            set
            {
                _userInput = value;
            }
            get
            {
                return _userInput;
            }
        }
    }

在窗口中调用并将值传递给成员：

 private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
        {
            Variables variable;

            //Passing user input to class member via constructor
            variable = new Variables(txtMainEntry.Text);

            //Get value from class member
            showUserEntry.Text = variable.UserInput;

            if (e.Key == Key.Return & variable.UserInput == "Hello World")
            {
                TargetWindow tWindow = new TargetWindow();
                tWindow.ShowDialog();
                this.Close();
            }
        }

如何在不使用静态成员的情况下访问另一个窗口中的相同值：

public partial class TargetWindow : Window
{
    public TargetWindow()
    {
        InitializeComponent();
    }

    private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
    {
        //How do I call and get the value of the class member 
        //set in the previous form
    }
}

Answer 1

除了使用静态值之外还有几种方法，我已经列出了其中一些

方法1 (Constructors)

    private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
    {
        Variables variable;

        //Passing user input to class member via constructor
        variable = new Variables(txtMainEntry.Text);

        //Get value from class member
        showUserEntry.Text = variable.UserInput;

        if (e.Key == Key.Return & variable.UserInput == "Hello World")
        {
            TargetWindow tWindow = new TargetWindow(variable);
            tWindow.ShowDialog();
            this.Close();
        }
    }

    public partial class TargetWindow : Window
    {
        Variables variable ;

        public TargetWindow(Variables variable)
        {
            InitializeComponent();
            this.variable = variable;
        }

        private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
        {
            //use variable field
        }
    }

方法2 (Properties)

    private void txtMainEntry_KeyUp(object sender, KeyEventArgs e)
    {
        Variables variable;

        //Passing user input to class member via constructor
        variable = new Variables(txtMainEntry.Text);

        //Get value from class member
        showUserEntry.Text = variable.UserInput;

        if (e.Key == Key.Return & variable.UserInput == "Hello World")
        {
            TargetWindow tWindow = new TargetWindow();
            tWindow.Variable = variable;
            tWindow.ShowDialog();
            this.Close();
        }
    }

    public partial class TargetWindow : Window
    {
        public Variables Variable { get; set; }

        public TargetWindow(Variables variable)
        {
            InitializeComponent();
        }

        private void lblDisplayVariableValue_Loaded(object sender, RoutedEventArgs e)
        {
            //use Variable property
        }
    }

Note:以上样本假设您必须通过variable，您可以根据需要进行更改

其他解决方案是使用附加属性，如果上述不可行，请告诉我，我将提供相同的样本。

访问先前窗口中设置的成员值，然后使用静态成员

1 个答案: