{"id":898,"date":"2021-09-18T15:51:49","date_gmt":"2021-09-18T07:51:49","guid":{"rendered":"http:\/\/www.wayln.com\/?p=898"},"modified":"2021-09-18T16:47:56","modified_gmt":"2021-09-18T08:47:56","slug":"%e7%bb%91%e5%ae%9a%e5%88%b0%e9%9d%9e%e5%85%83%e7%b4%a0%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/www.wayln.com\/?p=898","title":{"rendered":"\u7ed1\u5b9a\u5230\u975e\u5143\u7d20\u5bf9\u8c61"},"content":{"rendered":"<div id=\"toc_container\" class=\"toc_transparent no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#Source\"><span class=\"toc_number toc_depth_1\">1<\/span> Source\u5c5e\u6027<\/a><\/li><li><a href=\"#RelativSource\"><span class=\"toc_number toc_depth_1\">2<\/span> RelativSource\u5c5e\u6027<\/a><\/li><li><a href=\"#DataContext\"><span class=\"toc_number toc_depth_1\">3<\/span> DataContext\u5c5e\u6027<\/a><\/li><\/ul><\/div>\n<p>\u5f53\u7ed1\u5b9a\u5230\u975e\u5143\u7d20\u5bf9\u8c61\u65f6\uff0c\u9700\u8981\u653e\u5f03Binding.ElementName\u5c5e\u6027\uff0c\u5e76\u4f7f\u7528\u4ee5\u4e0b\u5c5e\u6027\u4e2d\u7684\u4e00\u4e2a\uff1a<br \/>\n&#8211; Source:\u8be5\u5c5e\u6027\u662f\u6307\u5411\u6e90\u5bf9\u8c61\u7684\u5f15\u7528\u2014\u2014\u6362\u53e5\u8bdd\u8bf4\uff0c\u662f\u63d0\u4f9b\u6570\u636e\u7684\u5bf9\u8c61<br \/>\n&#8211; RelativeSource:\u4f7f\u7528RelativeSource\u5bf9\u8c61\u6307\u5411\u6e90\u5bf9\u8c61\u3002\u6709\u4e86\u8fd9\u4e2a\u9644\u52a0\u5c42\uff0c\u53ef\u5728\u5f53\u524d\u5143\u7d20\uff08\u5305\u542b\u7ed1\u5b9a\u8868\u8fbe\u5f0f\u7684\u5143\u7d20\uff09\u7684\u57fa\u7840\u4e0a\u6784\u5efa\u5f15\u7528\u3002\u5728\u7f16\u5199\u7a7a\u95f4\u6a21\u677f\u4ee5\u53ca\u6570\u636e\u6a21\u677f\u65f6\u662f\u5f88\u65b9\u4fbf\u7684\u3002<br \/>\n&#8211; DataContext\uff1a\u5982\u679c\u6ca1\u6709\u4f7f\u7528Source\u6216\u6216RelativeSource\u5c5e\u6027\u6307\u5b9a\u6e90\uff0cWPF\u5c31\u4ece\u5f53\u524d\u5143\u7d20\u5f00\u59cb\u5728\u5143\u7d20\u6570\u4e2d\u5411\u4e0a\u67e5\u627e\u3002\u68c0\u67e5\u6ca1\u4e2a\u5143\u7d20\u7684DataContext\u5c5e\u6027\uff0c\u5e76\u4f7f\u7528\u7b2c\u4e00\u4e2a\u975e\u7a7a\u7684DataContext\u5c5e\u6027\u3002\u5f53\u6211\u8981\u5c06\u540c\u4e00\u4e2a\u5bf9\u8c61\u7684\u591a\u4e2a\u5c5e\u6027\u7ed1\u5b9a\u5230\u4e0d\u540c\u7684\u5143\u7d20\u65f6\uff0cDataContext\u5c5e\u6027\u662f\u975e\u5e38\u6709\u7528\u7684\uff0c\u56e0\u4e3a\u53ef\u5728\u66f4\u9ad8\u5c42\u6b21\u7684\u5bb9\u5668\u5bf9\u8c61\u4e0a\uff08\u800c\u4e0d\u662f\u76f4\u63a5\u5728\u76ee\u6807\u5143\u7d20\uff09\u8bbe\u7f6eDataContext\u5c5e\u6027\u3002<\/p>\n<h1><span id=\"Source\">Source\u5c5e\u6027<\/span><\/h1>\n<p>\u552f\u4e00\u7684\u95ee\u9898\u662f\u4e3a\u4e86\u8fdb\u884c\u7ed1\u5b9a\uff0c\u9700\u8981\u5177\u6709\u6570\u636e\u5bf9\u8c61\u3002\u53ef\u4ee5\u4ece\u8d44\u6e90\u4e2d\u63d0\u53d6\u6570\u636e\u5bf9\u8c61\uff0c\u53ef\u901a\u8fc7\u7f16\u5199\u4ee3\u7801\u751f\u6210\u6570\u636e\u5bf9\u8c61\u3002<br \/>\n1. \u6700\u7b80\u5355\u7684\u9009\u62e9\u662f\u5c06Source\u5c5e\u6027\u6307\u5411\u4e00\u4e9b\u5df2\u7ecf\u51c6\u5907\u597d\u7684\u9759\u6001\u5bf9\u8c61\uff0c<br \/>\n\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-XML line-numbers\">&lt;TextBlock Text=\"{Binding source={x:static SystemFonts.IconFontFamily},Path=Source}\"&gt;&lt;\/TextBlock&gt;\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u7ed1\u5b9a\u8868\u8fbe\u5f0f\u83b7\u53d6\u7531\u9759\u6001\u5c5e\u6027SystemFonts.IconFontFamily\u63d0\u4f9b\u7684FontFamily\u5bf9\u8c61\uff08\u6ce8\u610f\uff0c\u4e3a\u4e86\u8bbe\u7f6eBinding.Source\u5c5e\u6027\uff0c\u9700\u8981\u501f\u52a9\u9759\u6001\u6807\u8bb0\u6269\u5c55\uff09\u3002\u7136\u540e\uff0c\u5c06Binding.Path\u5c5e\u6027\u8bbe\u7f6e\u4e3aFontFamily.Source\u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u7ed9\u51fa\u4e86\u5b57\u4f53\u5bb6\u65cf\u7684\u540d\u5b57\u3002<br \/>\n2. \u53e6\u4e00\u79cd\u9009\u62e9\u662f\u7ed1\u5b9a\u5230\u5148\u524d\u4f5c\u4e3a\u8d44\u6e90\u521b\u5efa\u7684\u5bf9\u8c61<\/p>\n<pre><code class=\"language-XML line-numbers\">&lt;Window.Resources&gt;\n&lt;FontFamily 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\/>\n\u4e3a\u8bbe\u7f6eBinding.RelativeSource\u5c5e\u6027\uff0c\u9700\u8981\u4f7f\u7528RelativeSource\u5bf9\u8c61\u3002\u8fd9\u4f1a\u4f7f\u8bed\u6cd5\u66f4\u52a0\u590d\u6742\uff0c\u56e0\u4e3a\u9664\u4e86\u9700\u8981\u521bBinding\u5bf9\u8c61\u5916\uff0c\u8fd8\u9700\u8981\u5728\u5176\u4e2d\u521b\u5efa\u5d4c\u5957\u7684RelativeSource\u5bf9\u8c61\uff0c\u4e00\u79cd\u9009\u62e9\u662f\u4f7f\u7528\u5c5e\u6027\u8bbe\u7f6e\u8bed\u6cd5\u800c\u4e0d\u662f\u4f7f\u7528Binding\u6807\u8bb0\u6269\u5c55\u3002<\/p>\n<pre data-language=XML><code class=\"language-markup line-numbers\">&lt;TextBlock&gt;\n    &lt;TextBlock.Text&gt;\n        &lt;Binding Path=\"Title\"&gt;\n            &lt;Binding.RelativeSource&gt;\n                &lt;Binding.RelativeSource&gt;\n                    &lt;RelativeSource Mode=\"FindAncestor\" AncestorType=\"{x:Type Window}\"\/&gt;\n                &lt;\/Binding.RelativeSource&gt;\n            &lt;\/Binding.RelativeSource&gt;\n        &lt;\/Binding&gt;\n    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id=\"DataContext\">DataContext\u5c5e\u6027<\/span><\/h1>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f1a\u5c06\u5927\u91cf\u5143\u7d20\u7ed1\u5b9a\u5230\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002\u4f8b\u5982\uff0c\u5206\u6790\u4e0b\u9762\u4e00\u7ec4TexBlock\u5143\u7d20\uff0c\u6bcf\u4e2aTextBlock\u5143\u7d20\u90fd\u4f7f\u7528\u7c7b\u4f3c\u7684\u7ed1\u5b9a\u8868\u8fbe\u5f0f\u63d0\u53d6\u4e0e\u9ed8\u8ba4\u56fe\u6807\u5b57\u4f53\u76f8\u5173\u7684\u4e0d\u540c\u7ec6\u8282\uff0c\u5305\u62ec\u884c\u95f4\u8ddd\uff0c\u4ee5\u53ca\u6bcf\u4e00\u4e2a\u5b57\u4f53\u7684\u6837\u5f0f\u548c\u7c97\u7ec6\u3002\u53ef\u4ee5\u4e3a\u6bcf\u4e2aTextBlock\u5143\u7d20\u4f7f\u7528Source\u5c5e\u6027\uff0c\u4f46\u8fd9\u6837\u4f1a\u4f7f\u6807\u8bb0\u53d8\u5f97\u975e\u5e38\u957f\u3002<br \/>\n\u5bf9\u4e8e\u8fd9\u79cd\u60c5\u51b5\uff0c\u4f7f\u7528FrameworkElement.DataContext\u5c5e\u6027\u4e00\u6b21\u6027\u5b9a\u4e49\u7ed1\u5b9a\u6e90\u4f1a\u66f4\u6e05\u6670\uff0c\u4e5f\u66f4\u7075\u6d3b\u3002<\/p>\n<pre><code class=\"language-XML line-numbers\">&lt;StackPanel DataContext=\"{x:Static SystemFonts.IconFontFamily}\"&gt;\n&lt;TextBlock Margin=\"5\" Text=\"{Binding Path=Source}\"&gt;&lt;\/TextBlock&gt;\n&lt;\/StackPanel&gt;\n<\/code><\/pre>\n<p>WPF\u4f1a\u68c0\u67e5\u5143\u7d20\u7684DataContext\u5c5e\u6027\u3002\u5982\u679c\u5c5e\u6027\u503c\u4e3aNull,WPF\u4f1a\u7ee7\u7eed\u5411\u4e0a\u5728\u5143\u7d20\u6811\u79cd\u67e5\u627e\u7b2c\u4e00\u4e2a\u4e0d\u4e3anull\u7684\u6570\u636e\u4e0a\u4e0b\u6587\uff08\u6700\u521d\uff0c\u6240\u6709\u5143\u7d20\u7684DataContext\u5c5e\u6027\u90fd\u662fnull)\u3002\u5982\u679c\u627e\u5230\u4e86\u4e00\u4e2a\u6570\u636e\u4e0a\u4e0b\u6587\uff0c\u5c31\u4e3a\u7ed1\u5b9a\u4f7f\u7528\u627e\u5230\u7684\u6570\u636e\u4e0a\u4e0b\u6587\u3002\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u7ed1\u5b9a\u8868\u8fbe\u5f0f\u4e0d\u4f1a\u4e3a\u76ee\u6807\u5c5e\u6027\u5e94\u7528\u4efb\u4f55\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Contents1 Source\u5c5e\u60272 RelativSource\u5c5e\u60273 DataContext\u5c5e\u6027 \u5f53\u7ed1\u5b9a\u5230 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,35,36,2],"tags":[],"class_list":["post-898","post","type-post","status-publish","format-standard","hentry","category-c","category-wpf","category-2"],"_links":{"self":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=898"}],"version-history":[{"count":3,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/898\/revisions"}],"predecessor-version":[{"id":902,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/898\/revisions\/902"}],"wp:attachment":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}