索引超出范围.必须为非负数，且小于集合错误的大小 [英] Index was out of range.Must be non_negitive and less then size of the collection error

问题描述

public class Data
    {
        public string Print { get; set; }
    }

    public class AData
    {
        public int A0 { get; set; }
        public int A1 { get; set; }
        public int A2 { get; set; }
        public int A3 { get; set; }
        public int A4 { get; set; }
    }
    List<AData> grid2Data = new List<AData>(); 

载入事件

Load Event

 List<Data> data = new List<Data>();
 grid2Data.Add(new AData() { A0 = 0, A1 = 0, A2 = 0, A3 = 0, A4 = 0 });

GridView1.datasource=grid2data;
gridview1.databind();

if (e.Item.ItemType != ListItemType.Header && e.Item.ItemType != ListItemType.Footer)
        {
            
                Label lblTotal = e.Item.FindControl("lblSize") as Label;//e.Row.FindControl("lblPrint") as Label;
                string[] PrintData = lblTotal.Text.Split(',');
               
                foreach (string d in PrintData)
                {
                    if (d == "A0")
                    {
                        
                        TotalA0 = TotalA0 + 1;
                        grid2Data[0].A0 = grid2Data[0].A0+1;                      
                    }
                        
                    else if (d == "A1")
                    {
                        
                        TotalA1 = TotalA1 + 1;
                        grid2Data[0].A1 = grid2Data[0].A1 + 1;
                    }
                    else if (d == "A2")
                    {
                       
                        TotalA2 = TotalA2 + 1;
                        grid2Data[0].A2 = grid2Data[0].A2 + 1;
                    }
                    else if (d == "A3")
                    {
                        
                        TotalA3 = TotalA3 + 1;
                        grid2Data[0].A3 = grid2Data[0].A3 + 1;
                    }
                    else
                    {
                      
                        TotalA4 = TotalA4 + 1;
                        grid2Data[0].A4 = grid2Data[0].A4 + 1;
                    }
                   
               
            }

grid2Data [0] .A0 = grid2Data [0] .A0 + 1;


此行显示错误

grid2Data[0].A0 = grid2Data[0].A0+1;


this line it shows the error

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

推荐答案

基本上，这就是说虽然grid2Data是有效的集合-即，您已经执行了
行

Basically, it is saying that while grid2Data is a valid collection - i.e. you have executed the line

List<adata> grid2Data = new List<adata>(); </adata></adata>

您尚未添加任何对象.因为没有第一个元素，所以索引0被插入.

我可以看到这行

YOu have not added any objects to it. The index of 0 is invlaid because there is no first element.

I can see the line

grid2Data.Add(new AData() { A0 = 0, A1 = 0, A2 = 0, A3 = 0, A4 = 0 });

这显然在您的Load事件中，但是生成错误的代码在哪里?您将其放在单独的代码块中，因此很有可能位于构造函数或类似代码中.在我提到的两行上加上一个断点，再加上错误行，看看先发生了什么，然后找出需要移动的内容.目前，我无法为您提供帮助-我看不到足够的代码！ :laugh:

which is apparently in your Load event, but where is the code which is generating the error? You have it in a separate code block, so there is a good chance it is in the constructor or similar. Put a breakpoint on the two lines I mentioned, plus the error line, and see which happens first - then work out what needs to be moved. I can''t help you on that at this point - I can''t see enough of your code! :laugh:

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