您需要从嵌入资源所在的程序集中获取流。下面是如何读取它的示例代码。

// replace App with a class that is in the project where the embedded resource is.
        var assembly = typeof(App).GetTypeInfo().Assembly;
        // replace App3 with the namespace where your file is
        var stream = assembly.GetManifestResourceStream("App3.XMLFile1.xml");

        var lines = new List<string>();

        using var reader = new StreamReader(stream);

        while (reader.ReadLine() is { } line)
        {
            lines. Add(line);
        }