List< Label>投掷指数超出范围.必须为非负数并且小于集合的大小.错误 [英] List<Label> throwing Index was out of range. Must be non-negative and less than the size of the collection. error

问题描述

讨厌问这个，但是我要去哪里错了?

Hate to ask this but where am I going wrong?

public void foo(object sender, EventArgs e)
{
    List<Label> exerciseLabels = new List<Label>();

    string tempExercise = exerciseTextBox.Text;
    int numExercises = 0;
    day[tempDay].addExercise(numExercises, tempExercise);

    exerciseLabels.Add(new Label());
    exerciseLabels[1].Text = string.Format("{0}. {1}", numExercises + 1, tempExercise);

}

我收到的论点超出范围.

I am receiving an argument is out range.

谢谢.

推荐答案

List<Label> exerciseLabels = new List<Label>();
...
exerciseLabels.Add(new Label());
exerciseLabels[1].Text = ...

列表从0开始；第一项应为exerciseLabels[0].还是更好:

lists are 0-based; should be exerciseLabels[0] for the first item. Or better still:

var label = new Label();
label.Text = ...
exerciseLabels.Add(label);

无需访问索引器.

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