索引超出范围。必须大于集合参数名的大小非负少：指数 [英] Index was out of range. Must be non-negative and less than the size of the collection parameter name:index

问题描述

我想通过一个行添加数据为一体，在这里一个DataGridView是我的代码和它说：
索引超出范围必须大于集合的大小非负少
参数名称索引：这是什么意思吗？有没有在我的代码中的任何问题。

 字符串Sqlstr2 =从项目选择，其中ITEMNAME条目ID ='+ tbItemID.Text + '; 
 db.DataRead（Sqlstr2）; 
 ItemName字符串= db.dr [ITEMNAME]的ToString（）。 
 
的DataGridView dataGridView1 =新的DataGridView（）; 
 
 dataGridView1.Columns [0] .Name点=项目编号; 
 dataGridView1.Columns [1] .Name点=ITEMNAME; 
 dataGridView1.Columns [2] .Name点=数量; 
 dataGridView1.Columns [3] .Name点=单价; 
 dataGridView1.Columns [4] .Name点=金额; 
 
串firstColum = tbItemID.Text; 
串secondColum = ITEMNAME; 
串thirdColum = tbQuantity.Text; 
串fourthColum = Convert.ToString（单价）; 
串fifthColum = Convert.ToString（总和）; 
 
的String []行=新的String [] {firstColum，secondColum，thirdColum，fourthColum，fifthColum}; 
 dataGridView1.Rows.Add（行）; 
  

解决方案

你不添加列到你的 DataGridView的

 的DataGridView dataGridView1 =新的DataGridView（）; //创建新的网格
 
 dataGridView1.Columns [0] .Name点=项ID; //指其不存在
柱 

是否清楚现在为什么你得到一个异常？

您使用的列来修复错误之前添加此行

  dataGridView1.ColumnCount = 5; 
  

I'm trying to add data as one by one row to a datagridview here is my code and it says: "Index was out of range. Must be non-negative and less than the size of the collection parameter name:index" what does this means ? is there any problem in my code

String Sqlstr2 = "select ItemName from Item where ItemID = '" + tbItemID.Text + "'";
db.DataRead(Sqlstr2);
string ItemName = db.dr["ItemName"].ToString(); 

DataGridView dataGridView1 = new DataGridView();

dataGridView1.Columns[0].Name = "ItemID";
dataGridView1.Columns[1].Name = "ItemName";
dataGridView1.Columns[2].Name = "Qty";
dataGridView1.Columns[3].Name = "UnitPrice";
dataGridView1.Columns[4].Name = "Amount";

string firstColum = tbItemID.Text;
string secondColum = ItemName;
string thirdColum = tbQuantity.Text;
string fourthColum = Convert.ToString(UnitPrice);
string fifthColum = Convert.ToString(sum);

string[] row = new string[]{ firstColum, secondColum, thirdColum, fourthColum, fifthColum };
dataGridView1.Rows.Add(row);

解决方案

You're not adding columns to your DataGridView

DataGridView dataGridView1 = new DataGridView();//Create new grid

dataGridView1.Columns[0].Name = "ItemID";// refer to column which is not there 

Is it clear now why you get an exception?

Add this line before you use columns to fix the error

dataGridView1.ColumnCount = 5;

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