[英]Get the content of a row from sqlDataReader as a list
I have a SqlDataReader reader, where I don't know the data structure in advance, ie the number of columns is unkown. 我有一个SqlDataReader阅读器,我事先不知道数据结构,即列数未知。 I'd like to put the table in csv file.
我想将表格放在csv文件中。 I retrieve the columns from
我从中检索列
System.Data.DataTable dt = reader.GetSchemaTable();
So I have them in dt.Columns() after it. 所以我在dt.Columns()之后有它们。 Then, I want to do something like this:
然后,我想做这样的事情:
while (reader.Read())
{
writer.WriteLine(string.Join(";",ListWithRowContent))
}
However, I have it hard to put the content of a row into ListWithRowContent list with something like linq .Select , but "reader" object can't be queried. 但是,我很难用linq .Select之类的内容将行的内容放入ListWithRowContent列表中,但是无法查询“ reader”对象。
Question: how to do it (please no for loop!)? 问题:该怎么做(请不要循环!)?
Assuming, that reader is positioned on any record: 假设该读者位于任何记录中:
var values = new Object[reader.FieldCount];
reader.GetValues(values);
writer.WriteLine(string.Join(";", values.Select(v => v.ToString())));
or more convenient way (FW 4.0 or higher): 或更便捷的方式(FW 4.0或更高版本):
var values = new Object[reader.FieldCount];
reader.GetValues(values);
writer.WriteLine(string.Join(";", values));
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