C# 指数超出范围。必须为非负且小于集合参数 name:index 的大小
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Index was out of range. Must be non-negative and less than the size of the collection parameter name:index
提问by user2566013
I'm trying to add data as one by one row to a datagridview here is my code and it says:
我正在尝试将数据逐行添加到数据网格视图中，这是我的代码，它说：
"Index was out of range. Must be non-negative and less than the size of the collection parameter name:index"
“索引超出范围。必须为非负且小于集合参数名称的大小：索引”
What does this mean? What is the problem in my code?
这是什么意思？我的代码有什么问题？
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);
采纳答案by Sriram Sakthivel
You're not adding columns to your DataGridView
你没有在你的 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?
现在清楚为什么会出现异常了吗？
Add this line before you use columns to fix the error
在使用列修复错误之前添加此行
dataGridView1.ColumnCount = 5;
回答by Sachin
what this means ? is there any problem in my code
这是什么意思？我的代码有问题吗
It means that you are accessing a location or index which is not present in collection.
这意味着您正在访问集合中不存在的位置或索引。
To find this, Make sure your Gridview has 5 columns as you are using it's 5th column by this line
要找到这一点，请确保您的 Gridview 有 5 列，因为您正在使用此行的第 5 列
dataGridView1.Columns[4].Name = "Amount";
Here is the image which shows the elements of an array. So if your gridview has less column then the (index + 1)by which you are accessing it, then this exception arises.
这是显示数组元素的图像。因此，如果您的 gridview 的列少于(index + 1)您访问它的列，则会出现此异常。
回答by meilke
dataGridView1.Columnsis probably of a length less than 5. Accessing dataGridView1.Columns[4]then will be outside the list.
dataGridView1.Columns长度可能小于 5。访问dataGridView1.Columns[4]then 将在列表之外。
回答by Floris
The error says "The index is out of range". That means you were trying to index an object with a value that was not valid. If you have two books, and I ask you to give me your third book, you will look at me funny. This is the computer looking at you funny. You said - "create a collection". So it did. But initially the collection is empty: not only is there nothing in it - it has no space to hold anything. "It has no hands".
错误提示“索引超出范围”。这意味着您试图用无效的值索引一个对象。如果你有两本书，而我请你把你的第三本书给我，你会看我很有趣。这是电脑看着你很有趣。你说 - “创建一个集合”。所以它做到了。但最初这个集合是空的：不仅里面什么都没有——它没有空间容纳任何东西。“它没有手”。
Then you said "the first element of the collection is now 'ItemID'". And the computer says "I never was asked to create space for a 'first item'." I have no hands to hold this item you are giving me.
然后你说“集合的第一个元素现在是'ItemID'”。电脑说“我从来没有被要求为‘第一件物品’创造空间。” 我没有手拿你给我的这个东西。
In terms of your code, you created a view, but never specified the size. You need a
就您的代码而言，您创建了一个视图，但从未指定大小。你需要一个
dataGridView1.ColumnCount = 5;
Before trying to access any columns. Modify
在尝试访问任何列之前。调整
DataGridView dataGridView1 = new DataGridView();
dataGridView1.Columns[0].Name = "ItemID";
to
到
DataGridView dataGridView1 = new DataGridView();
dataGridView1.ColumnCount = 5;
dataGridView1.Columns[0].Name = "ItemID";
See http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.columncount.aspx
请参阅http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.columncount.aspx
回答by Kamran Binyamin
This error is caused when you have enabled paging in Grid view. If you want to delete a record from grid then you have to do something like this.
当您在网格视图中启用分页时会导致此错误。如果你想从网格中删除一条记录，那么你必须做这样的事情。
int index = Convert.ToInt32(e.CommandArgument);
int i = index % 20;
// Here 20 is my GridView's Page Size.
GridViewRow row = gvMainGrid.Rows[i];
int id = Convert.ToInt32(gvMainGrid.DataKeys[i].Value);
new GetData().DeleteRecord(id);
GridView1.DataSource = RefreshGrid();
GridView1.DataBind();
Hope this answers the question.
希望这能回答这个问题。
