{"id":407104,"date":"2024-02-22T14:16:22","date_gmt":"2024-02-22T06:16:22","guid":{"rendered":"https:\/\/www.idc.net\/help\/407104\/"},"modified":"2024-02-22T14:16:22","modified_gmt":"2024-02-22T06:16:22","slug":"linq%e5%8c%bf%e5%90%8d%e7%b1%bb%e5%9e%8b%e5%89%96%e6%9e%90","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/407104\/","title":{"rendered":"LINQ\u533f\u540d\u7c7b\u578b\u5256\u6790"},"content":{"rendered":"

LINQ\u6709\u5f88\u591a\u503c\u5f97\u5b66\u4e60\u7684\u5730\u65b9\uff0c\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u4ecb\u7ecdLINQ\u533f\u540d\u7c7b\u578b\uff0c\u5305\u62ec\u4ecb\u7ecd\u65b0\u5efa\u4e00\u4e2a\u5177\u6709City\u548cDistance \u4e24\u4e2a\u5c5e\u6027\u7684LINQ\u533f\u540d\u7c7b\u578b\u6765\u5b9e\u73b0\u7b49\u65b9\u9762<\/p>\n

LINQ\u533f\u540d\u7c7b\u578b(Anonymous Types)<\/strong><\/p>\n

LINQ\u80fd\u591f\u5229\u7528\u7684\u53e6\u4e00\u4e2aC#\u548cVB\u65b0\u7279\u6027\u4e4b\u4e00\u5c31\u662f\u5bf9\u201cLINQ\u533f\u540d\u7c7b\u578b\u201d\u7684\u652f\u6301\u3002\u8fd9\u5141\u8bb8\u4f60\u4e0d\u9700\u660e\u786e\u58f0\u660e\u5bf9\u8c61\u6a21\u578b\u5c31\u80fd\u5f88\u5bb9\u6613\u5730\u521b\u5efa\u548c\u4f7f\u7528\u5185\u8054\u7684\u7c7b\u578b\u7ed3\u6784\uff0c\u56e0\u4e3a\u7c7b\u578b\u53ef\u4ee5\u901a\u8fc7\u6570\u636e\u7684\u521d\u59cb \u5316\u63a8\u65ad\u51fa\u6765\u3002\u8fd9\u5728\u4f7f\u7528LINQ\u67e5\u8be2\u201c\u81ea\u5b9a\u4e49\u6784\u5f62(custom shape)\u201d\u6570\u636e\u65f6\u975e\u5e38\u7684\u6709\u7528\u3002<\/p>\n

\u4f8b\u5982\uff0c\u8003\u8651\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff1a\u4f60\u6b63\u5728\u5904\u7406\u4e00\u4e2a\u5177\u6709\u8bb8\u591a\u5c5e\u6027\u7684\u6570\u636e\u5e93\u6216\u8005\u5f3a\u7c7b\u578b\u7684\u96c6\u5408\uff0d\u4f46\u662f\u4f60\u53ea\u5173\u5fc3\u5176\u4e2d\u5c11\u6570\u7684 \u51e0\u4e2a\u5b57\u6bb5\u3002\u4e0e\u521b\u5efa\u548c\u5904\u7406\u6574\u4e2a\u7c7b\u578b\u76f8\u6bd4\uff0c\u4ec5\u8fd4\u56de\u4f60\u6240\u9700\u8981\u7684\u5b57\u6bb5\u5c06\u4f1a\u66f4\u52a0\u6709\u7528\u4e9b\u3002\u6211\u4eec\u6765\u65b0\u5efa\u4e00\u4e2a\"step6.aspx\"\u6587\u4ef6\u6765\u5b9e\u73b0\u4ee5\u4e0a\u64cd\u4f5c\uff1a<\/font><\/p>\n

\n \n \n 
    \n  \n  \n  
  1. <<\/font><\/strong>%@ Page Language<\/font>=\"C#\"<\/font> AutoEventWireup<\/font>=\"true\"<\/font> 
    CodeFile<\/font>=\"Step6.aspx.cs\"<\/font> Inherits<\/font>=\"Step6\"<\/font> %><\/font><\/strong> <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
  2.    <\/span><\/li>\n  \n  \n  
  3. <html><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  4. <body><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  5. <form<\/span><\/span><\/font><\/strong> id<\/font>=\"form1\"<\/font> runat<\/font>=\"server\"<\/font>><\/font><\/strong> <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
  6. <div><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  7.    <\/span><\/li>\n  \n  \n  
  8. <h1><\/span><\/span><\/span><\/font><\/strong>Anonymous Type<\/h1><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/span><\/li>\n  \n  \n  
  9.    <\/span><\/li>\n  \n  \n  
  10. <asp:GridView<\/span><\/span><\/font><\/strong> ID<\/font>=\"GridView1\"<\/font> runat<\/font>=\"server\"<\/font>><\/font><\/strong> <\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
  11. <\/asp:GridView><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  12.    <\/span><\/li>\n  \n  \n  
  13. <\/div><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  14. <\/form><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  15. <\/body><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n  \n  \n  
  16. <\/html><\/span><\/span><\/span><\/font><\/strong> <\/span><\/span><\/li>\n \n \n <\/ol><\/pre>\n
    \u5728\u6211\u4eec\u7684\u540e\u53f0\u4ee3\u7801\u6587\u4ef6\u4e2d\u6211\u4eec\u5c06\u7f16\u5199\u4e00\u4e2a\u4f7f\u7528LINQ\u533f\u540d\u7c7b\u578b\u7684LINQ\u67e5\u8be2\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
    \n \n \n 
      \n  \n  \n  
    1. using System;  <\/span><\/span><\/li>\n  \n  \n  
    2. using System.Web.UI;  <\/span><\/li>\n  \n  \n  
    3. using System.Query;  <\/span><\/li>\n  \n  \n  
    4.    <\/span><\/li>\n  \n  \n  
    5. public partial class Step6 : System.Web.UI.Page  <\/span><\/li>\n  \n  \n  
    6. {  <\/span><\/li>\n  \n  \n  
    7. protected void Page_Load(object sender, EventArgs e)  <\/span><\/li>\n  \n  \n  
    8. {  <\/span><\/li>\n  \n  \n  
    9. TravelOrganizer travel<\/font> = new<\/font> TravelOrganizer();  <\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
    10.    <\/span><\/li>\n  \n  \n  
    11. GridView1.DataSource<\/font> = from<\/font> location in travel.PlacesVisited  <\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
    12. & nbsp; orderby location.City  <\/span><\/li>\n  \n  \n  
    13. & nbsp; select new {  <\/span><\/li>\n  \n  \n  
    14. & nbsp; & nbsp;City<\/font> = location<\/font>.City,  <\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
    15. & nbsp; & nbsp;Distance<\/font> = location<\/font>.Distance  <\/span><\/span><\/span><\/span><\/span><\/li>\n  \n  \n  
    16. & nbsp; };  <\/span><\/li>\n  \n  \n  
    17.  <\/span><\/li>\n  \n  \n  
    18. GridView1.DataBind();  <\/span><\/li>\n  \n  \n  
    19. }  <\/span><\/li>\n  \n  \n  
    20. }  <\/span><\/li>\n \n \n <\/ol><\/pre>\n
      \u6ce8\u610f\uff0c\u6211\u4eec\u5e76\u6ca1\u6709\u50cf\u4e0a\u9762\u4e00\u6837\u4eceselect\u5b50\u53e5\u4e2d\u8fd4\u56de\u4e00\u4e2a\"location\"\u5bf9\u8c61\uff0c\u6211\u4eec\u901a\u8fc7\u65b0\u5efa\u4e00\u4e2a\u5177\u6709City\u548cDistance \u4e24\u4e2a\u5c5e\u6027\u7684LINQ\u533f\u540d\u7c7b\u578b\u6765\u5b9e\u73b0\u3002\u8fd9\u4e24\u4e2a\u5c5e\u6027\u7684\u7c7b\u578b\u662f\u6839\u636e\u5b83\u4eec\u521d\u59cb\u5316\u65f6\u8d4b\u4e0e\u7684\u503c\u6765\u81ea\u52a8\u786e\u5b9a\u7684\uff0c\u5728\u8fd9\u91cc\u662f\u4e00\u4e2a\u662f string\uff0c\u53e6\u4e00\u4e2a\u662fint\u3002<\/p>\n
      \u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n
        \n
      1. LINQ to SQL Table\u6d45\u8c08<\/font><\/li>\n
      2. Linq\u8bed\u53e5\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6cd5<\/font><\/li>\n
      3. Ling to sql\u66f4\u65b0\u5b9e\u4f53\u6982\u8ff0<\/font><\/li>\n
      4. Linq\u5b9e\u4f53\u7ee7\u627f\u7b80\u5355\u63cf\u8ff0<\/font><\/li>\n
      5. Linq Library\u6982\u8ff0<\/font><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
        LINQ\u6709\u5f88\u591a\u503c\u5f97\u5b66\u4e60\u7684\u5730\u65b9\uff0c\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u4ecb\u7ecdLINQ\u533f\u540d\u7c7b\u578b\uff0c\u5305\u62ec\u4ecb\u7ecd\u65b0\u5efa\u4e00\u4e2a\u5177\u6709City\u548cDistance […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-407104","post","type-post","status-publish","format-standard","hentry","category-website"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/407104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=407104"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/407104\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=407104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=407104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=407104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}