Question

表1：父级{列：ParentId，名称}

表2：Child {列：ChildId，ChildName}

表3：关系{列：RelationshipId，PrimaryId（ParentId），SecondaryId（子ID）}

Answer 1

尝试以下操作：

           DataTable parentTable = new DataTable();
           parentTable.Columns.Add("ParentId", typeof(string));
           parentTable.Columns.Add("Name", typeof(string));

           DataTable childTable = new DataTable();
           childTable.Columns.Add("ParentId", typeof(string));
           childTable.Columns.Add("ChildNameName", typeof(string));

           DataTable relationshipTable = new DataTable();
           relationshipTable.Columns.Add("RelationshipId", typeof(string));
           relationshipTable.Columns.Add("PrimaryId", typeof(string));
           relationshipTable.Columns.Add("SecondaryId", typeof(string));

           var results = (from r in relationshipTable.AsEnumerable()
                          join p in parentTable.AsEnumerable() on r.Field<string>("PrimaryId") equals p.Field<string>("ParentId")
                          join c in childTable.AsEnumerable() on r.Field<string>("SecondaryId") equals c.Field<string>("ChildID")
                          select new { r = r, p = p, c = c })
                         .ToList();

我想在包含三个不同数据表的数据表上使用内部联接，并使用c＃将结果作为合并数据表返回

1 个答案: