从 WPF 应用程序中的文本框获取用户输入

问题描述

我正在尝试从我正在构建的 WPF 应用程序中的文本框中获取用户输入.用户将输入一个数值，我想将它存储在一个变量中.我刚刚开始使用 C#.我该怎么做?

I am trying to get user input from the textbox in a WPF application I am building. The user will enter a numeric value and I would like to store it in a variable. I am just starting on C#. How can I do it?

目前我正在打开文本框并让用户输入值.之后，用户必须按下一个按钮，将文本框中的文本存储在一个变量中.

Currently I am opening the textbox and letting the user enter the value. After that the user has to press a button upon which the text from textbox is stored in a variable.

private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    var h = text1.Text;
}

我知道这是不对的.什么是正确的方法?

I know this isn't right. What is the right way?

推荐答案

就像@Michael McMullin 已经说过的，你需要像这样在函数外定义变量:

Like @Michael McMullin already said, you need to define the variable outside your function like this:

string str;

private void Button_Click(object sender, RoutedEventArgs e)
{
    str = text1.Text;
}

// somewhere ...
DoSomething(str);

重点是:变量的可见性取决于它的作用域.请看一下这个解释.

The point is: the visibility of variable depends on its scope. Please take a look at this explanation.

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