“1类”的名字并不在命名空间中存在“使用：Binding_2”

Question

<page> 
x:Class="Binding_2.MainPage" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="using:Binding_2" 
    xmlns:data="using:Binding_2" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d"> 
    <Page.DataContext> 
     <local:Class1/> 
    </Page.DataContext> 
</page> 

，我有一个在namespace Binding_2

namespace Binding_2 
{ 
    class Class1 
    { 
     public Class1() 
     { 

     } 
    } 
} 

但class1它不工作，并显示错误：

The name "Class1" does not exist in the namespace "using:Binding_2"

Answer 1

C＃中类的默认范围是internal，使其成为public：

namespace Binding_2 
{ 
    public class Class1 
    { 
     public Class1() 
     { 

     } 
    } 
}