c# - 在 C# 控制台中对 Datable 进行 Linq 查询

Question

var query = from r in dataTable.AsEnumerable()
                where (r.Field<double?>(dataTable.Columns[0]).Equals(invoiceNo))
                select new
                        {
                            invoice = r.Field<double>(dataTable.Columns[0]),
                            name = r.Field<string>(dataTable.Columns[1]),
                            emp_id = r.Field<double>(dataTable.Columns[2]),
                            won = r.Field<double>(dataTable.Columns[3]),
                            expenses = r.Field<double>(dataTable.Columns[4]),
                        };

这是我的 linq 查询，它从 dataTable 中读取所有数据。

 I want the query to be converted again into a datatable.Is it possible?

Answer 1

您可以使用方法CopyToDataTable：

 DataTable dt = (from r in dataTable.AsEnumerable()
                where (r.Field<double?>(dataTable.Columns[0]).Equals(invoiceNo)))
             .CopyToDataTable();

Answer 2

您可以使用

dataTable.PrimaryKey = new DataColumn[]{_dataTable.Columns["Invoice"]};

dataTable.Rows.Find(invoiceNo)