XAML - 多次设置属性“内容"

XAML - 多次设置属性“内容

问题描述：

对 WPF 和 XAML 来说非常新.我不明白为什么我不能在下面的代码中放置 WPF 控件.我的问题是标签在哪里.我放在这个地方的任何东西都会给我'属性'内容'设置不止一次'

Very new to WPF and XAML. I can't get my head around why I can't place a WPF control where I would like in the following code. My issue is where the <canvas></canvas> tags are. Anything I put in this place gives me 'The property 'Content' is set more than once'

如果有人能简单地解释一下 Content 属性的设置位置，那将是最有帮助的.

If anyone could explain in simple terms where the Content property is set that would be most helpful.

我查看了以下文章无济于事:多次设置内容"属性多次设置属性内容属性内容设置不止一次多次设置内容"属性按钮 WPF ControlTemplate 导致错误 "属性 'content'设置不止一次"

I have checked out the following articles to no avail: the property 'Content' is set more than once the property content is set more than once Property content is set more than once The property 'Content' is set more than once Button WPF ControlTemplate causeing error "The property 'content' is set more than once"

<Window x:Class="PDFIndexer.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid x:Name="ParentGrid">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="1*" />
        <RowDefinition Height="25" />
    </Grid.RowDefinitions>
    <Menu Grid.Row="0" >
        <MenuItem Header="File" >
            <MenuItem Header="Open Project" Click="MenuItem_Click_1"></MenuItem>
            <MenuItem Header="Save Project"></MenuItem>
            <MenuItem Header="Close Project"></MenuItem>
            <Separator></Separator>
            <MenuItem Header="Exit"></MenuItem>
        </MenuItem>
        <MenuItem Header="Edit"></MenuItem>
    </Menu>
    <TabControl Grid.Row="1">
        <TabItem Header="Document Flow" >
            This is where the outline of the entire document will be placed.
            <Canvas></Canvas>
         </TabItem>
        <TabItem Header="Preview">
            This is where the preview will be drawn to screen.
        </TabItem>
        <TabItem Header="Resources">
            This is where the resources { graphic files, fonts, data files }
        </TabItem>
        <TabItem Header="Code Library">
            This is where the user can save re-usable bits of code. Useful when adding intel barcodes or Address blocks etc...
        </TabItem>
    </TabControl>


    <StatusBar Grid.Row="2">
        Items
    </StatusBar>
</Grid>

答

通过将文本描述添加到 TabItem，您添加了内容，然后当您添加画布时，您添加了一个附加的内容项目TabItem.您需要使用可以容纳集合的控件子，例如 Canvas、Grid、StackPanel 等.尝试这样的操作.

By adding your text description to your TabItem you added Content then when you added the Canvas you added an additional item of Content which is not allowed for the TabItem. You need to use a Control that can hold a collection of Children such as Canvas, Grid, StackPanel etc. Try something like this.

<TabControl Grid.Row="1">
    <TabItem Header="Document Flow">
        <Canvas>
            <TextBlock>
                This is where the outline of the entire document will be placed.
            </TextBlock>
        </Canvas>
    </TabItem>
    <TabItem Header="Preview">
        This is where the preview will be drawn to screen.
    </TabItem>
    <TabItem Header="Resources">
        This is where the resources { graphic files, fonts, data files }
    </TabItem>
    <TabItem Header="Code Library">
        This is where the user can save re-usable bits of code. Useful when adding intel barcodes or Address blocks etc...
    </TabItem>
</TabControl>

XAML - 多次设置属性“内容"

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