{"id":492,"date":"2018-04-02T18:43:35","date_gmt":"2018-04-02T10:43:35","guid":{"rendered":"http:\/\/www.fh1986.com\/?p=492"},"modified":"2018-04-02T18:43:35","modified_gmt":"2018-04-02T10:43:35","slug":"c%e4%bb%a3%e7%a0%81%e4%b8%ad%e5%ae%9e%e7%8e%b0%e4%b8%a4%e4%b8%aa%e8%a1%a8%ef%bc%88datatable%ef%bc%89%e7%9a%84%e5%85%b3%e8%81%94%e6%9f%a5%e8%af%a2%ef%bc%88join%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.fh1986.com\/index.php\/archives\/492.html","title":{"rendered":"C#\u4ee3\u7801\u4e2d\u5b9e\u73b0\u4e24\u4e2a\u8868\uff08DataTable\uff09\u7684\u5173\u8054\u67e5\u8be2\uff08JOIN\uff09"},"content":{"rendered":"

\u4e4b\u524d\u901a\u5e38\u90fd\u662f\u4f7f\u7528SQL\u76f4\u63a5\u4ece\u6570\u636e\u5e93\u4e2d\u53d6\u51fa\u88681\u548c\u88682\u5173\u8054\u67e5\u8be2\u540e\u7684\u6570\u636e\uff0c\u53ea\u9700\u8981\u7528\u4e00\u4e2aJOIN\u5c31\u53ef\u4ee5\u4e86\uff0c\u975e\u5e38\u65b9\u4fbf\u3002\u8fd1\u65e5\u9047\u5230\u4e00\u79cd\u60c5\u51b5\uff0c\u4e24\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5df2\u7ecf\u53d6\u5230\u4ee3\u7801\u4e2d\uff0c\u9700\u8981\u5728\u4ee3\u7801\u4e2d\u5c06\u8fd9\u4e24\u4e2a\u8868\u5173\u8054\u8d77\u6765\uff0c\u5e76\u5f97\u5230\u5b83\u4eec\u6a2a\u5411\u62fc\u5728\u4e00\u8d77\u4e4b\u540e\u7684\u5b8c\u6574\u6570\u636e\u3002<\/p>\n

<\/p>\n

\u5982\uff1a\u88681–\u5546\u54c1\u4fe1\u606f\u8868\uff08dtHead\uff09\uff0c\u5b58\u653e\u5546\u54c1\u7684ID\u548c\u540d\u79f0\uff0c\u8868\u7ed3\u6784\u548c\u6570\u636e\u5982\u4e0b\uff1a <\/p>\n

\"\" <\/p>\n

     \u88682–\u5546\u54c1\u6570\u91cf\u53ca\u91d1\u989d\u8868\uff08dtTail\uff09\uff0c\u5b58\u653e\u5546\u54c1\u7684\u6570\u91cf\u3001\u91d1\u989d\uff0c\u8868\u7ed3\u6784\u548c\u6570\u636e\u5982\u4e0b\uff1a <\/p>\n

\"\"<\/p>\n

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\"\" <\/p>\n

\u5728C#\u4ee3\u7801\u4e2d\uff0c\u8981\u5c06\u8fd9\u4e24\u4e2a\u8868\u62fc\u63a5\u8d77\u6765\uff0c\u6709\u5f88\u591a\u7b28\u529e\u6cd5\uff0c\u4f8b\u5982\u5faa\u73af\u83b7\u53d6\u6570\u636e\u4e00\u6761\u6761\u62fc\u8d77\u6765\uff0c\u4f46\u5728\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5728\u5b57\u6bb5\u591a\u7684\u65f6\u5019\u4e5f\u9700\u8981\u5199\u4e00\u5927\u5806\u7ed9\u6bcf\u4e2a\u5b57\u6bb5\u4f9d\u6b21\u8d4b\u503c\u7684\u4ee3\u7801\u3002 <\/p>\n

\u4f7f\u7528LINQ\u53ef\u4ee5\u5e2e\u52a9\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\u3002\u4e0b\u9762\u63d0\u4f9b\u4e86\u4e24\u79cd\u65b9\u6848\uff1a <\/p>\n

\u65b9\u6848\u4e00\uff1a\u5f53\u80fd\u591f\u786e\u5b9aDtAll\u8868\u7684\u5b57\u6bb5\uff0c\u5e76\u4e14\u5b57\u6bb5\u4e0d\u662f\u5f88\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u663e\u5f0f\u5199\u51fa\uff1a <\/p>\n

\"\u590d\u5236\u4ee3\u7801\"<\/a><\/p>\n

           var query1 =\n                from rHead in dtHead.AsEnumerable()\n                from rTail in dtTail.AsEnumerable()\n                where rHead.Field<Int32>(\"GoodID\") == rTail.Field<Int32>(\"GoodID\")\n                select new \n                {\n                    GoodID = rHead.Field<Int32>(\"GoodID\"),\n                    GoodName = rHead.Field<String>(\"GoodName\"),\n                    Num = rTail.Field<Int32>(\"Num\"),\n                    Money = rTail.Field<Int32>(\"Money\")\n                };\n\n            DataTable dtNew = DtAll.Copy();\n            foreach (var obj in query1)\n            {\n                dtNew.Rows.Add(obj.GoodID, obj.GoodName, obj.Num, obj.Money);\n            }<\/pre>\n
  <\/p>\n
\u5176\u4e2dDtAll\u7684\u8868\u7ed3\u6784\u5df2\u7ecf\u4e8b\u5148\u521b\u5efa\u597d\u4e86\uff0c\u5728\u4e0b\u9762\u4f1a\u7ed9\u51fa\u6240\u6709\u4ee3\u7801\u3002\n<\/p>\n
\u65b9\u6848\u4e8c\uff1aLINQ\u63d0\u4f9b\u4e86\u4e0eSQL\u4e2d\u7c7b\u4f3c\u7684JOIN\u65b9\u6cd5\u3002\u5e76\u4e14\u5f53\u5b57\u6bb5\u5f88\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e00\u4e2a\u5b57\u6bb5\u90fd\u5728select new\u4e2d\u5199\u51fa\u6765\u6bd4\u8f83\u9ebb\u70e6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u7684\u65b9\u5f0f\uff1a\n<\/p>\n
 <\/p>\n
            var query =\n                from rHead in dtHead.AsEnumerable()\n                join rTail in dtTail.AsEnumerable()\n                on rHead.Field<Int32>(\"GoodID\") equals rTail.Field<Int32>(\"GoodID\")\n                select rHead.ItemArray.Concat(rTail.ItemArray.Skip(1));\n\n            foreach (var obj in query)\n            {\n                DataRow dr = DtAll.NewRow();\n                dr.ItemArray = obj.ToArray();\n                DtAll.Rows.Add(dr);\n            }
<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a>\n<\/p>\n
\u4f7f\u7528Concat\u5c06\u88681\u548c\u88682\u7684\u5b57\u6bb5\u62fc\u63a5\u8d77\u6765\uff0c\u4f5c\u4e3a\u603b\u8868DtAll\u7684\u5b57\u6bb5\uff0c\u4f46\u7531\u4e8e\u88681\u3001\u88682\u4e2d\u90fd\u5b58\u5728\u5b57\u6bb5GoodID\uff0c\u4e0d\u80fd\u5728\u8868\u4e2d\u51fa\u73b0\u91cd\u590d\u7684\u5b57\u6bb5\uff0c\u56e0\u6b64\u4f7f\u7528Skip(1)\u8df3\u8fc7\u88682\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bb5GoodID\u3002\n<\/p>\n
\u4e0b\u9762\u7ed9\u51fa\u8fd9\u4e2a\u5c0f\u4f8b\u5b50\u5b8c\u6574\u7684\u4ee3\u7801\uff08\u4e0d\u5305\u62ec\u7a97\u4f53\uff0c\u7a97\u4f53\u4e0a\u5f88\u7b80\u5355\uff0c\u53ea\u6709\u4e00\u4e2a\u6309\u94ae\uff09\n<\/p>\n
\u9996\u5148\u5199\u5165\u6d4b\u8bd5\u6570\u636e\uff1a\u628a\u88681\u3001\u88682\u521b\u5efa\u8d77\u6765\u5e76\u63d2\u5165\u5982\u4e0a\u56fe\u6240\u793a\u7684\u6570\u636e\uff08\u5b9e\u9645\u60c5\u51b5\u662f\u88681\u3001\u88682\u901a\u8fc7\u5176\u4ed6\u6e20\u9053\u76f4\u63a5\u83b7\u53d6\u5230\u4ee3\u7801\u4e2d\u7684\uff09\n<\/p>\n
\u7136\u540e\u5728\u5355\u51fb\u201c\u8fde\u63a5\u201d\u6309\u94ae\u65f6\uff0c\u5f97\u5230\u88681\u3001\u88682\u6a2a\u5411\u8fde\u63a5\u540e\u7684\u8868\uff1a\n<\/p>\n
 <\/p>\n
using System;\nusing System.Collections.Generic;\nusing System.Linq;\nusing System.Text;\nusing System.Windows;\nusing System.Windows.Controls;\nusing System.Windows.Data;\nusing System.Windows.Documents;\nusing System.Windows.Input;\nusing System.Windows.Media;\nusing System.Windows.Media.Imaging;\nusing System.Windows.Navigation;\nusing System.Windows.Shapes;\nusing System.Data;\n\nnamespace WpfApplication1\n{\n    \/\/\/ <summary>\n    \/\/\/ MainWindow.xaml \u7684\u4ea4\u4e92\u903b\u8f91\n    \/\/\/ <\/summary>\n    public partial class MainWindow : Window\n    {\n        DataTable dtHead = new DataTable();\n        DataTable dtTail = new DataTable();\n        DataTable DtAll = new DataTable();\n\n        public MainWindow()\n        {\n            InitializeComponent();\n\n            this.AddData();\n        }\n\n        \/\/\/ <summary>\n        \/\/\/ \u521b\u5efa\u8868\u7ed3\u6784\uff0c\u6dfb\u52a0\u6570\u636e\u6e90\n        \/\/\/ <\/summary>\n        private void AddData()\n        {\n            dtHead.Columns.Add(\"GoodID\", typeof(Int32));\n            dtHead.Columns.Add(\"GoodName\", typeof(String));\n\n            dtTail.Columns.Add(\"GoodID\", typeof(Int32));\n            dtTail.Columns.Add(\"Num\", typeof(Int32));\n            dtTail.Columns.Add(\"Money\", typeof(Int32));\n\n            DtAll.Columns.Add(\"GoodID\", typeof(Int32));\n            DtAll.Columns.Add(\"GoodName\", typeof(String));\n            DtAll.Columns.Add(\"Num\", typeof(Int32));\n            DtAll.Columns.Add(\"Money\", typeof(Int32));\n\n            this.AddRow(1, \"\u9752\u5c9b\u7eaf\u751f\", 10, 30);\n            this.AddRow(2, \"\u54c8\u5c14\u6ee8\u5564\u9152\", 5, 20);\n        }\n\n        \/\/\/ <summary>\n        \/\/\/ \u6dfb\u52a0\u6570\u636e\n        \/\/\/ <\/summary>\n        \/\/\/ <param name=\"goodID\"><\/param>\n        \/\/\/ <param name=\"goodName\"><\/param>\n        \/\/\/ <param name=\"num1\"><\/param>\n        \/\/\/ <param name=\"num2\"><\/param>\n        private void AddRow(Int32 goodID, String goodName, Int32 num1,Int32 num2)\n        {\n            DataRow drH = dtHead.NewRow();\n            drH[\"GoodID\"] = goodID;\n            drH[\"GoodName\"] = goodName;\n            dtHead.Rows.Add(drH);\n\n            DataRow drT = dtTail.NewRow();\n            drT[\"GoodID\"] = goodID;\n            drT[\"Num\"] = num1;\n            drT[\"Money\"] = num2;\n            dtTail.Rows.Add(drT);\n        }\n\n        \/\/\/ <summary>\n        \/\/\/ \u201c\u8fde\u63a5\u201d\u6309\u94ae\u5355\u51fb\u4e8b\u4ef6\n        \/\/\/ <\/summary>\n        \/\/\/ <param name=\"sender\"><\/param>\n        \/\/\/ <param name=\"e\"><\/param>\n        private void btn_Join_Click(object sender, RoutedEventArgs e)\n        {\n            \/\/\u65b9\u6848\u4e00\n            var query1 =\n                from rHead in dtHead.AsEnumerable()\n                from rTail in dtTail.AsEnumerable()\n                where rHead.Field<Int32>(\"GoodID\") == rTail.Field<Int32>(\"GoodID\")\n                select new \n                {\n                    GoodID = rHead.Field<Int32>(\"GoodID\"),\n                    GoodName = rHead.Field<String>(\"GoodName\"),\n                    Num = rTail.Field<Int32>(\"Num\"),\n                    Money = rTail.Field<Int32>(\"Money\")\n                };\n\n            DataTable dtNew = DtAll.Copy();\n            foreach (var obj in query1)\n            {\n                dtNew.Rows.Add(obj.GoodID, obj.GoodName, obj.Num, obj.Money);\n            }\n\n            \/\/\u65b9\u6848\u4e8c\n            var query =\n                from rHead in dtHead.AsEnumerable()\n                join rTail in dtTail.AsEnumerable()\n                on rHead.Field<Int32>(\"GoodID\") equals rTail.Field<Int32>(\"GoodID\")\n                select rHead.ItemArray.Concat(rTail.ItemArray.Skip(1));\n\n            foreach (var obj in query)\n            {\n                DataRow dr = DtAll.NewRow();\n                dr.ItemArray = obj.ToArray();\n                DtAll.Rows.Add(dr);\n            }\n        }\n    }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u4e4b\u524d\u901a\u5e38\u90fd\u662f\u4f7f\u7528SQL\u76f4\u63a5\u4ece\u6570\u636e\u5e93\u4e2d\u53d6\u51fa\u88681\u548c\u88682\u5173\u8054\u67e5\u8be2\u540e\u7684\u6570\u636e\uff0c\u53ea\u9700\u8981\u7528\u4e00\u4e2aJOIN\u5c31\u53ef\u4ee5\u4e86\uff0c\u975e\u5e38\u65b9\u4fbf\u3002\u8fd1 … \u7ee7\u7eed\u9605\u8bfbC#\u4ee3\u7801\u4e2d\u5b9e\u73b0\u4e24\u4e2a\u8868\uff08DataTable\uff09\u7684\u5173\u8054\u67e5\u8be2\uff08JOIN\uff09<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/posts\/492"}],"collection":[{"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/comments?post=492"}],"version-history":[{"count":0,"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/posts\/492\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/media?parent=492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/categories?post=492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fh1986.com\/index.php\/wp-json\/wp\/v2\/tags?post=492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}