我需要按括号中的日期订购以下列名:
“姓名”,“年龄”,“abc(5/2010)”,“def(12/2010)”“efa(5/2011)”“ace(12/2011)”
如何使用LINQ订购这些产品?
我试过这种方法。看起来我不应该用LINQ来做所有这些:
Dictionary<DataColumn, DateTime> columns = new Dictionary<DataColumn, DateTime>();
int startIndex;
int endIndex;
for (int i = 0; i < table.Columns.Count; ++i)
{
// these columns need to be sorted
startIndex = table.Columns[i].Caption.IndexOf('(');
endIndex = table.Columns[i].Caption.IndexOf(')');
if (startIndex > 0 && endIndex > 0)
{
// create a standard date
string monthYear = table.Columns[i].Caption.Substring(
startIndex + 1, endIndex - startIndex - 1);
columns.Add(
table.Columns[i],
DateTime.Parse(monthYear.Replace("/", "/01/")).Date);
}
else
{
// all other columns should be sorted first
columns.Add(table.Columns[i], DateTime.MinValue);
}
}
// perform the LINQ order by
columns = columns.OrderBy(o => o.Value).ToDictionary(o => o.Key, o => o.Value);
// order the original table uses the dictionary
for (int i = 0; i < columns.Count; ++i)
{
table.Columns[columns.Keys.ElementAt(i).Caption].SetOrdinal(i);
}
答案 0 :(得分:1)
OrderBy.ThenBy不起作用。您需要将结果分配给另一个变量。