将组合框字符串值转换为int [英] Convert combobox string value to int

问题描述

我对转换类型有疑问。我想将当前选择的组合框值字符串更改为int，但是出现错误

I have a question about converting types. I want to change the currently selected combobox value string to an int, but I get errors

我的代码：

int.Parse(age.SelectedItem.ToString());

该问题该怎么办？

推荐答案

好了，现在我们知道该错误了，您可以在尝试使用以下方法解析空值之前检查它是否为空：

Ok now we know the error, you can check for a null value before trying to parse it using:

    if (comboBox1.SelectedItem != null)
    {
        int x = int.Parse(comboBox1.SelectedItem.ToString());
    }
    else { //Value is null }

您可以避免通过将控件的text属性设置为所需的默认值来传递null值。

You can avoid a null value being passed by setting the text property of the control to what ever default value you want.

如果在确保已选择某个值后仍未获得值，则可以确实需要发布您的代码。

If you are still not getting a value after making sure one is selected you really need to post your code.

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