[英]How to export my DataGridView to a csv file?
I'm trying to export my DataGridView
to csv
file with this code: 我正在尝试使用以下代码将DataGridView
导出到csv
文件:
private void saveToCsv(DataGridView dGV, string filename)
{
if (dGV.RowCount > 0)
{
DataTable dt = new DataTable();
dt = dGV.DataSource as DataTable;
int d = dt.Columns.Count;
int c = dt.Rows.Count;
foreach (var column in dt.Columns.Cast<DataColumn>().ToArray())
{
if (dt.AsEnumerable().All(dr => dr.IsNull(column)))
d--;
}
string stOutput = "";
DataGridViewRow ds = new DataGridViewRow();
StreamWriter swOut = new StreamWriter(filename);
//write header rows to csv
for (int i = 0; i <= d - 1; i++)
{
if (i > 0)
{
swOut.Write(",");
}
swOut.Write(dGV.Columns[i].HeaderText);
}
swOut.WriteLine();
//write DataGridView rows to csv
for (int j = 0; j <= c - 1; j++)
{
if (dt.Rows[j].IsNull)
if (j > 0)
{
swOut.WriteLine();
}
ds = dGV.Rows[j];
for (int i = 0; i <= d - 1; i++)
{
if (i > 0)
{
swOut.Write(",");
}
stOutput = ds.Cells[i].Value.ToString();
//replace comma's with spaces
stOutput = stOutput.Replace(',', ' ');
//replace embedded newlines with spaces
stOutput = stOutput.Replace(Environment.NewLine, " ");
swOut.Write(stOutput);
}
}
swOut.Close();
}
MessageBox.Show("Data successfully saved");
}
but the output is this: 但是输出是这样的:
0.512,45,tested_negative 0.966,33,tested_negative 0.42,35,tested_negative 0.665,46,tested_positive 0.329,29,tested_negative ,, ,, ,, ,, ,, ,, ,, ,,
The empty rows get exported too. 空行也将导出。
How can I fix this problem? 我该如何解决这个问题?
1st you should qualify your text data incase they have commas in them if your going to create a comma delimited file 首先,如果要创建逗号分隔的文件,则应限制文本数据的大小写,以防它们中包含逗号
taken from stackoverflow (ref Exporting datagridview to csv file ) 取自stackoverflow(请参阅将datagridview导出到csv文件 )
var sb = new StringBuilder();
var headers = dGV.Columns.Cast<DataGridViewColumn>();
sb.AppendLine(string.Join(",", headers.Select(column => "\"" + column.HeaderText + "\"").ToArray()));
foreach (DataGridViewRow row in dataGridView1.Rows)
{
var cells = row.Cells.Cast<DataGridViewCell>();
string temp string.Join(",", cells.Select(cell => "\"" + cell.Value + "\"").ToArray())
temp = temp.Replace(",","");
temp = temp.Replace("\"","");
if(temp.Length > 0)
{
sb.AppendLine(string.Join(",", cells.Select(cell => "\"" + cell.Value + "\"").ToArray()));
}
}
System.IO.StreamWriter file = new System.IO.StreamWriter(@"c:\test\hereIam.csv");
file.WriteLine(sb.ToString()); //
If you want to stick with your code, check the stOutput
- if it is ',,'
do not write it into the file. 如果要坚持使用代码,请检查stOutput
如果它是',,'
请不要将其写入文件中。
You might want to check https://stackoverflow.com/a/4959869/7505395 - one of the answers to c# datatable to csv 您可能要检查https://stackoverflow.com/a/4959869/7505395-C#数据表 到CSV的答案之一
// ... your code ...
if ( stOutput != ",,")
swOut.Write(stOutput);
else suppressNewLine = true; // suppress newline above, and reset bool to false
// ... more of your code ...
You have to fix the empty newlines after that. 之后,您必须修复空白的换行符。
Best thing to do would be to assemble each line (or the whole table gasp ) into a StringBuilder
- and write it only once (or at least line-wise) to the file when (line or whole table) is fully assembled. 最好的办法是将每行(或整个表gasp )组装到StringBuilder
-并在完全组装(行或整个表)时仅一次(或至少逐行)地将其写入文件。
StringBuilders are build for itereatively adding to them and should make your code much faster. StringBuilders是为向其迭代添加而构建的,应该使您的代码更快。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.