{"id":55,"date":"2026-03-30T09:23:37","date_gmt":"2026-03-30T01:23:37","guid":{"rendered":"https:\/\/blog.bandifee.com\/?p=55"},"modified":"2026-03-30T09:23:38","modified_gmt":"2026-03-30T01:23:38","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-c-%e7%9a%84-range-index%ef%bc%88%e5%88%87%e7%89%87%e8%af%ad%e6%b3%95%ef%bc%89%ef%bc%9a%e5%8e%9f%e7%90%86%e4%b8%8e%e6%80%a7%e8%83%bd%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/blog.bandifee.com\/index.php\/2026\/03\/30\/%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-c-%e7%9a%84-range-index%ef%bc%88%e5%88%87%e7%89%87%e8%af%ad%e6%b3%95%ef%bc%89%ef%bc%9a%e5%8e%9f%e7%90%86%e4%b8%8e%e6%80%a7%e8%83%bd%e8%a7%a3%e6%9e%90\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3 C# \u7684 Range \/ Index\uff08\u5207\u7247\u8bed\u6cd5\uff09\uff1a\u539f\u7406\u4e0e\u6027\u80fd\u89e3\u6790"},"content":{"rendered":"\n

C# 8 \u5f15\u5165\u4e86\u4e00\u4e2a\u975e\u5e38\u4f18\u96c5\u7684\u8bed\u6cd5\u7cd6\uff1aRange \/ Index\uff08\u5207\u7247\u8bed\u6cd5\uff09<\/strong>\u3002
\u4f60\u53ef\u80fd\u5df2\u7ecf\u7528\u8fc7\uff1a<\/p>\n\n\n\n

var sub = arr[1..^1];<\/code><\/pre>\n\n\n\n
\u4f46\u5b83\u5230\u5e95\u662f\u600e\u4e48\u5de5\u4f5c\u7684\uff1f
\ud83d\udc49 \u662f\u8bed\u6cd5\u7cd6\uff1f\u4f1a\u4e0d\u4f1a\u590d\u5236\uff1f\u6027\u80fd\u5982\u4f55\uff1f<\/strong><\/p>\n\n\n\n
\u8fd9\u7bc7\u6587\u7ae0\u5e2e\u4f60\u5f7b\u5e95\u641e\u61c2\u5b83\u7684\u5e95\u5c42\u903b\u8f91\u3002<\/p>\n\n\n\n
\n\n\n\n
\ud83e\udde0 \u4e00\u3001\u4e24\u4e2a\u6838\u5fc3\u7c7b\u578b<\/h1>\n\n\n\n
C# \u5207\u7247\u8bed\u6cd5\u80cc\u540e\uff0c\u5176\u5b9e\u662f\u4e24\u4e2a\u7ed3\u6784\u4f53\uff1a<\/p>\n\n\n\n
\n\n\n\n
\ud83d\udd39 Index\uff08\u7d22\u5f15\uff09<\/h2>\n\n\n\n
Index i = 3;     \/\/ \u4ece\u524d\u5f80\u540e\nIndex j = ^1;    \/\/ \u4ece\u540e\u5f80\u524d\uff08\u5012\u6570\u7b2c\u4e00\u4e2a\uff09<\/code><\/pre>\n\n\n\n
\ud83d\udc49 ^<\/code> \u8868\u793a\u4ece\u672b\u5c3e\u5f00\u59cb\u8ba1\u6570<\/p>\n\n\n\n
\u7b49\u4ef7\u4e8e\uff1a<\/p>\n\n\n\n
new Index(1, fromEnd: true)<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udd39 Range\uff08\u8303\u56f4\uff09<\/h2>\n\n\n\n
Range r = 1..5;<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u8868\u793a\u533a\u95f4 [1, 5)<\/code>\uff08\u5de6\u95ed\u53f3\u5f00\uff09<\/p>\n\n\n\n
\n\n\n\n
\ud83d\udce6 \u4e8c\u3001\u8bed\u6cd5\u7cd6\u5c55\u5f00\uff08\u6838\u5fc3\u539f\u7406\uff09<\/h1>\n\n\n\n
\u2728 \u5199\u6cd5<\/h2>\n\n\n\n
var sub = arr[1..4];<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udd0d \u7f16\u8bd1\u5668\u4f1a\u505a\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n
\u7b49\u4ef7\u4e8e\uff08\u6982\u5ff5\u4e0a\uff09\uff1a<\/p>\n\n\n\n
var range = new Range(new Index(1), new Index(4));\nvar sub = arr.Slice(range); \/\/ \u6216\u7c7b\u4f3c\u903b\u8f91<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u5173\u952e\u70b9\uff1a<\/p>\n\n\n\n
    \n
  • Range<\/code> \u53ea\u662f\u63cf\u8ff0\u8303\u56f4<\/li>\n\n\n\n
  • \u771f\u6b63\u884c\u4e3a\u7531\u7c7b\u578b\u51b3\u5b9a\uff08\u6570\u7ec4 \/ Span \/ string\uff09<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    \u26a0\ufe0f \u4e09\u3001\u6570\u7ec4 vs Span\uff08\u672c\u8d28\u533a\u522b\uff09<\/h1>\n\n\n\n
    \u8fd9\u662f\u6700\u91cd\u8981\u7684\u90e8\u5206\ud83d\udc47<\/p>\n\n\n\n
    \n\n\n\n
    \u274c \u6570\u7ec4\u5207\u7247\uff08\u4f1a\u590d\u5236\uff09<\/h2>\n\n\n\n
    var sub = arr[1..4];<\/code><\/pre>\n\n\n\n
    \ud83d\udc49 \u5b9e\u9645\u884c\u4e3a\uff1a<\/p>\n\n\n\n
    var sub = new int[3];\nArray.Copy(arr, 1, sub, 0, 3);<\/code><\/pre>\n\n\n\n
    \u2714\ufe0f \u65b0\u6570\u7ec4
    \u2714\ufe0f \u6570\u636e\u590d\u5236
    \u274c \u6709\u6027\u80fd\u5f00\u9500<\/p>\n\n\n\n
    \n\n\n\n
    \u2705 Span \u5207\u7247\uff08\u96f6\u62f7\u8d1d\uff09<\/h2>\n\n\n\n
    var sub = arr.AsSpan()[1..4];<\/code><\/pre>\n\n\n\n
    \ud83d\udc49 \u5b9e\u9645\u884c\u4e3a\uff1a<\/p>\n\n\n\n
    var sub = span.Slice(1, 3);<\/code><\/pre>\n\n\n\n
    \u2714\ufe0f \u4e0d\u521b\u5efa\u65b0\u6570\u7ec4
    \u2714\ufe0f \u4e0d\u590d\u5236\u6570\u636e
    \u2714\ufe0f \u53ea\u662f\u6539\u53d8\u89c6\u56fe\u8303\u56f4<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udcca \u56db\u3001\u56fe\u89e3\u7406\u89e3\uff08\u975e\u5e38\u91cd\u8981\uff09<\/h1>\n\n\n\n
    \u539f\u6570\u7ec4<\/h2>\n\n\n\n
    arr: [0][1][2][3][4][5]\n        \u2191<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u274c arr[1..4]<\/h2>\n\n\n\n
    new array:\n[1][2][3]<\/code><\/pre>\n\n\n\n
    \ud83d\udc49 \u5b8c\u6574\u590d\u5236<\/p>\n\n\n\n
    \n\n\n\n
    \u2705 Span<\/h2>\n\n\n\n
    pointer \u2192 arr[1]\nlength  \u2192 3<\/code><\/pre>\n\n\n\n
    \ud83d\udc49 \u53ea\u662f\u201c\u770b\u201d\u8fd9\u4e00\u6bb5<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\ude80 \u4e94\u3001\u5e38\u89c1\u5199\u6cd5\u603b\u7ed3<\/h1>\n\n\n\n
    \n\n\n\n
    \u2714\ufe0f \u57fa\u7840\u5207\u7247<\/h2>\n\n\n\n
    arr[0..3]   \/\/ \u524d3\u4e2a\narr[3..]    \/\/ \u4ece3\u5230\u7ed3\u5c3e\narr[..3]    \/\/ \u4ece\u5934\u52303\narr[..]     \/\/ \u6574\u4e2a\u6570\u7ec4\uff08\u590d\u5236\uff09<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u2714\ufe0f \u4f7f\u7528 ^\uff08\u4ece\u540e\u5f80\u524d\uff09<\/h2>\n\n\n\n
    arr[^1]     \/\/ \u6700\u540e\u4e00\u4e2a\narr[^3..]   \/\/ \u6700\u540e\u4e09\u4e2a\narr[..^1]   \/\/ \u53bb\u6389\u6700\u540e\u4e00\u4e2a\narr[1..^1]  \/\/ \u53bb\u5934\u53bb\u5c3e<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u26a1 \u516d\u3001\u6027\u80fd\u5206\u6790\uff08\u5173\u952e\uff09<\/h1>\n\n\n\n
    \u5199\u6cd5<\/th>\u662f\u5426\u590d\u5236<\/th>\u662f\u5426\u5206\u914d\u5185\u5b58<\/th>\u63a8\u8350<\/th><\/tr>
    arr[..]<\/code><\/td>\u2705<\/td>\u2705<\/td>\u274c<\/td><\/tr>
    arr[1..4]<\/code><\/td>\u2705<\/td>\u2705<\/td>\u274c<\/td><\/tr>
    Span[..]<\/code><\/td>\u274c<\/td>\u274c<\/td>\u2705<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n
    \ud83d\udc49 \u7ed3\u8bba\uff1a<\/p>\n\n\n\n
    \n
    Range \u662f\u8bed\u6cd5\u7cd6\uff0c\u6027\u80fd\u53d6\u51b3\u4e8e\u5e95\u5c42\u7c7b\u578b\uff01<\/strong><\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    \ud83e\udde0 \u4e03\u3001\u4e3a\u4ec0\u4e48\u8bbe\u8ba1\u6210\u8fd9\u6837\uff1f<\/h1>\n\n\n\n
    \u5f88\u591a\u4eba\u4f1a\u95ee\uff1a<\/p>\n\n\n\n
    \ud83d\udc49 \u4e3a\u4ec0\u4e48\u6570\u7ec4\u4e0d\u76f4\u63a5\u652f\u6301\u201c\u96f6\u62f7\u8d1d\u5207\u7247\u201d\uff1f<\/p>\n\n\n\n
    \u539f\u56e0\u662f\uff1a<\/p>\n\n\n\n
    \u274c \u5982\u679c\u6570\u7ec4\u5171\u4eab\u5185\u5b58\uff1a<\/h3>\n\n\n\n
      \n
    • \u4fee\u6539\u4e00\u4e2a\u5f71\u54cd\u53e6\u4e00\u4e2a<\/li>\n\n\n\n
    • GC \u65e0\u6cd5\u6b63\u786e\u7ba1\u7406<\/li>\n\n\n\n
    • \u5bb9\u6613\u4ea7\u751f\u9690\u5f0f\u526f\u4f5c\u7528<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      \u2705 \u6240\u4ee5\u8bbe\u8ba1\u4e3a\uff1a<\/h3>\n\n\n\n
        \n
      • \u6570\u7ec4 \u2192 \u5b89\u5168\uff08\u590d\u5236\uff09<\/li>\n\n\n\n
      • Span \u2192 \u9ad8\u6027\u80fd\uff08\u5171\u4eab\uff09<\/li>\n<\/ul>\n\n\n\n
        \ud83d\udc49 \u8fd9\u662f\u4e00\u4e2a\u201c\u5b89\u5168 vs \u6027\u80fd\u201d\u7684\u8bbe\u8ba1\u5e73\u8861<\/p>\n\n\n\n
        \n\n\n\n
        \ud83d\udd25 \u516b\u3001\u5e95\u5c42\u65b9\u6cd5\uff08\u8fdb\u9636\uff09<\/h1>\n\n\n\n
        \u4f60\u53ef\u4ee5\u624b\u52a8\u4f7f\u7528\uff1a<\/p>\n\n\n\n
        arr.AsSpan().Slice(start, length);<\/code><\/pre>\n\n\n\n
        \ud83d\udc49 \u8fd9\u5176\u5b9e\u5c31\u662f Range \u7684\u5e95\u5c42\u5b9e\u73b0\u65b9\u5f0f<\/p>\n\n\n\n
        \n\n\n\n
        \ud83e\udde0 \u4e5d\u3001\u4e00\u4e2a\u5173\u952e\u8ba4\u77e5\uff08\u5f88\u591a\u4eba\u4e0d\u77e5\u9053\uff09<\/h1>\n\n\n\n
        \ud83d\udc49 Range \u672c\u8eab\uff1a<\/p>\n\n\n\n
          \n
        • \u274c \u4e0d\u64cd\u4f5c\u6570\u636e<\/li>\n\n\n\n
        • \u274c \u4e0d\u5207\u7247<\/li>\n\n\n\n
        • \u2705 \u53ea\u662f\u4e00\u4e2a\u201c\u63cf\u8ff0\u533a\u95f4\u7684\u7ed3\u6784\u4f53\u201d<\/li>\n<\/ul>\n\n\n\n
          \u771f\u6b63\u7684\u884c\u4e3a\u7531\uff1a<\/p>\n\n\n\n
            \n
          • array<\/code><\/li>\n\n\n\n
          • Span<\/code><\/li>\n\n\n\n
          • string<\/code><\/li>\n<\/ul>\n\n\n\n
            \u6765\u51b3\u5b9a<\/p>\n\n\n\n
            \n\n\n\n
            \ud83d\ude80 \u5341\u3001\u5b9e\u6218\u5efa\u8bae<\/h1>\n\n\n\n
            \n\n\n\n
            \u2714\ufe0f \u666e\u901a\u4e1a\u52a1\u4ee3\u7801<\/h2>\n\n\n\n
            var sub = arr[1..4];<\/code><\/pre>\n\n\n\n
            \ud83d\udc49 \u53ef\u8bfb\u6027\u4f18\u5148<\/p>\n\n\n\n
            \n\n\n\n
            \u2714\ufe0f \u7b97\u6cd5 \/ \u6027\u80fd\u4f18\u5316\uff08\u4f60\u73b0\u5728\u91cd\u70b9\uff09<\/h2>\n\n\n\n
            var sub = arr.AsSpan()[1..4];<\/code><\/pre>\n\n\n\n
            \ud83d\udc49 \u96f6\u62f7\u8d1d + \u9ad8\u6027\u80fd<\/p>\n\n\n\n
            \n\n\n\n
            \u2714\ufe0f \u6781\u81f4\u4f18\u5316<\/h2>\n\n\n\n
            Span<int> s = arr;\nvar sub = s[1..4];<\/code><\/pre>\n\n\n\n
            \n\n\n\n
            \ud83d\udccc \u5341\u4e00\u3001\u603b\u7ed3<\/h1>\n\n\n\n
            \n
            Range \/ Index \u662f\u8bed\u6cd5\u7cd6\uff0c\u672c\u8eab\u4e0d\u505a\u4efb\u4f55\u6570\u636e\u64cd\u4f5c\uff0c\u771f\u6b63\u7684\u884c\u4e3a\u7531\u5e95\u5c42\u7c7b\u578b\u51b3\u5b9a\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
            \u8bb0\u4f4f\u8fd9\u4e09\u70b9\uff1a<\/p>\n\n\n\n
              \n
            1. ..<\/code> = Range\uff08\u8303\u56f4\uff09<\/li>\n\n\n\n
            2. ^<\/code> = \u4ece\u672b\u5c3e\u8ba1\u6570<\/li>\n\n\n\n
            3. \u6570\u7ec4\u5207\u7247\u4f1a\u590d\u5236\uff0cSpan \u4e0d\u4f1a<\/li>\n<\/ol>\n\n\n\n
              \n\n\n\n
              \ud83e\udde0 \u6700\u7ec8\u4e00\u53e5\u8bdd<\/h1>\n\n\n\n
              \ud83d\udc49 Range \u662f\u201c\u63cf\u8ff0\u201d\uff0cSpan \u624d\u662f\u201c\u6027\u80fd\u201d<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
              C# 8 \u5f15\u5165\u4e86\u4e00\u4e2a\u975e\u5e38\u4f18\u96c5\u7684\u8bed\u6cd5\u7cd6\uff1aRange \/ Index\uff08\u5207\u7247\u8bed\u6cd5\uff09\u3002\u4f60\u53ef\u80fd\u5df2\u7ecf\u7528\u8fc7\uff1a \u4f46\u5b83\u5230\u5e95\u662f\u600e\u4e48\u5de5\u4f5c\u7684\uff1f\ud83d\udc49 \u662f\u8bed\u6cd5\u7cd6 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[13],"tags":[8],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-13","tag-c"],"_links":{"self":[{"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/posts\/55","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/comments?post=55"}],"version-history":[{"count":1,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/posts\/55\/revisions"}],"predecessor-version":[{"id":56,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/posts\/55\/revisions\/56"}],"wp:attachment":[{"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/media?parent=55"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/categories?post=55"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bandifee.com\/index.php\/wp-json\/wp\/v2\/tags?post=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}