如何使用linq作为完全加入连接到单个表中的表列

Question

在我的项目中，

我有两张桌子

（1）Import_detail table (Date, Description,Parti_Name, Company_name,Amount )和 （2）Export_detail table (Date, Description,Parti_Name, Company_name,Amount )

我希望使用linq在DataGrid中将此详细信息显示为表格详细信息。 在这里我使用工会加入合并专栏，但我不知道如何保持平衡

作为这张表。

我正在使用linq lambda Expression。 请帮帮我。

此处代码为联合表

var query = dm.Import_detail.Select(r => r).Union( dm.Export_detail .Select.Select(q => q));

Answer 1

看看这个例子。可能是你想要的。 我有3个班级

public class Import
    {
        public DateTime date { get; set; }
        public decimal amount { get; set; }
    }

    public class Export
    {
        public DateTime date { get; set; }
        public decimal amount { get; set; }
    }

    public class Result
    {
        public DateTime date { get; set; }
        public decimal creditAmount { get; set; }
        public decimal debitAmount { get; set; }
        public decimal balanceAmount { get; set; }
    }

选择

var importList = new List<Import>()
                {
                    new Import{date = DateTime.Parse("2009-01-02"), amount = 10000},
                    new Import{date = DateTime.Parse("2009-01-25"), amount = 6000}
                };

                var exportList = new List<Export>()
                {
                    new Export{date = DateTime.Parse("2009-01-05"), amount = 500},
                    new Export{date = DateTime.Parse("2009-01-10"), amount = 1000},
                    new Export{date = DateTime.Parse("2009-01-11"), amount = 1500},
                    new Export{date = DateTime.Parse("2009-01-15"), amount = 4000},
                    new Export{date = DateTime.Parse("2009-01-28"), amount = 5000}
                };


                var temp = importList.Select(c => new Result { date = c.date, debitAmount = c.amount, creditAmount = 0, balanceAmount = 0 }).Union(
                    exportList.Select(c => new Result { date = c.date, debitAmount = 0, creditAmount = c.amount, balanceAmount = 0 })).GroupBy(c => c.date).Select(c => new Result { date = c.Key, creditAmount = c.Sum(g => g.creditAmount), debitAmount = c.Sum(g => g.debitAmount) }).OrderBy(c => c.date).ToList();

                foreach (var item in temp)
                    item.balanceAmount = temp.Where(c => c.date < item.date).OrderByDescending(c => c.date).Select(c => c.balanceAmount).FirstOrDefault() + item.debitAmount - item.creditAmount;

结果：

debitAmount  creditAmount balanceAmount
10000        0            10000
0            500          9500
0            1000         8500
0            1500         7000
0            4000         3000
6000         0            9000 
0            5000         4000