C# 错误消息“索引超出范围。必须为非负且小于集合的大小。参数名称：索引”
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/18749055/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Error message "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"
提问by Animesh Ghosh
I have a DataGridView. I want to add column 4 values. I wrote this code. But it shows above error on Total += Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[4].Value);.
我有一个DataGridView. 我想添加第 4 列的值。我写了这段代码。但它在Total += Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[4].Value);.
decimal Total = 0;
for (int i = 0; i < dgvSalesFooterAdd.Rows.Count; i++)
{
dgvSalesFooterAdd.Rows[i].Cells[4].Value =
Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[3].Value) *
Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[3].Value);
Total += Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[4].Value);
}
lblFinalTotalAdd.Text = Total.ToString();
Creating 5th column code:
创建第 5 列代码：
OleDbConnection con = new OleDbConnection(conn);
con.Open();
DataTable dtusers = new DataTable();
OleDbCommand cmd = new OleDbCommand("Select Shorts,Code,Description,Percentage from SalesFields", con);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
da.Fill(dtusers);
dgvSalesFooterAdd.DataSource = dtusers;
dgvSalesFooterAdd.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
dgvSalesFooterAdd.Columns[0].Name = "Shorts";
dgvSalesFooterAdd.Columns[1].Name = "Code";
dgvSalesFooterAdd.Columns[2].Name = "Description";
dgvSalesFooterAdd.Columns[3].Name = "Percentage";
dgvSalesFooterAdd.Columns[0].HeaderText = "Shorts";
dgvSalesFooterAdd.Columns[1].HeaderText = "Code";
dgvSalesFooterAdd.Columns[2].HeaderText = "Description";
dgvSalesFooterAdd.Columns[3].HeaderText = "Percentage";
DataGridViewColumn amount = new DataGridViewColumn();
amount.HeaderText = "Amount";
amount.Name = "Amount";
amount.CellTemplate = new DataGridViewTextBoxCell();
dgvSalesFooterAdd.Columns.Insert(4, amount);
con.Close();
con.Close();
回答by Bart Friederichs
C#'s arrays are zero-based. This means the first element is element 0. The 4th element is element 3.
C# 的数组是从零开始的。这意味着第一个元素是元素 0。第四个元素是元素 3。
You probably have only four columns, numbered 0 to 3.
您可能只有四列，编号为 0 到 3。
回答by 123 456 789 0
Try this,
尝试这个，
decimal Total = 0;
for (int i = 0; i < dgvSalesFooterAdd.Rows.Count; i++)
{
dgvSalesBodyAdd.Rows[i].Cells[3].Value =
Convert.ToDecimal(dgvSalesBodyAdd.Rows[i].Cells[2].Value) *
Convert.ToDecimal(dgvSalesBodyAdd.Rows[i].Cells[2].Value);
Total += Convert.ToDecimal(dgvSalesFooterAdd.Rows[i].Cells[3].Value);
}
lblFinalTotalAdd.Text = Total.ToString();
