C#中的索引错误，数组应返回空数组，但返回范围超出范围 [英] Index Error in C# Where Array Should Return Empty Array But Returns Out Of Range

问题描述

我是C#的新手，并且遇到一个错误，我需要让DataPoints数组返回空值，但是由于任何原因我都遇到了此错误.我在这里做什么错了?

I'm new to C# and having an error where I need to have the DataPoints array to return empty but I'm getting this error for whatever reason. What am I doing wrong here?

索引超出范围.必须为非负数且小于\ r \ n参数名称:index"

Index was out of range. Must be non-negative and less than the size of the collection.\r\nParameter name: index"

            var DataPoints = new DataPoints();
            // Generate DataPoints (or something similar) from the newly constructed WspViewList.
            foreach (WspViewRow row in dataPointBuilder)
            {
            
            var dataPointList = row.OriginalData.TrimStart('[').TrimEnd(']').Split(',').ToList();

            DataPoints.labels.Add(dataPointList[1]);

            for (var index = 2; index< dataPointList.Count; index++)
            {
                var dataPoint = dataPointList[index];
                if (string.IsNullOrEmpty(dataPoint))
                    continue;
                ChartDataObject cdo;
                if (DataPoints.datasets.Count <= index - 2)
                {
                    cdo = new ChartDataObject();
                    DataPoints.datasets.Add(cdo);
                    cdo.label = ColumnObjects[index].propertyName;
                }
                else
                    cdo = DataPoints.datasets[index - 2];

                cdo.data.Add(dataPoint);
                DataPoints.datasets[index - 2] = cdo;
            }
            
                DataPointAPI DataPointResponse = new DataPointAPI()
                {

                data = DataPoints,

                };

                dataset.Add(DataPointResponse);
            }

        // Set some class field to contain these datapoints
        ChartData = dataset;

推荐答案

当您获得异常时，您可以获取发生异常的行号.您还可以使用debbuger查看是否错过了某些内容.

When you get the exception, you could get the line number where it happend. You can also use debbuger to see if you miss something.

实际上，您尝试通过异地访问数组/列表中的数据而引发异常.请记住，索引从 0 到阵列的总长度-1

Actually your exception is throwed by trying to accessing data outsite your array / list. Remember that your index is starting from 0 to total length of your array - 1

var array = new []{1,2,3};
array[0] => 1
array[1] => 2
array[2] => 3
array[3] => out of range

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