论坛 › .Net › 如何在 .NET MAUI 中加载 json 文件？

立聪堂德州十三局店 发表于 2022-11-15 02:33:39

如何在 .NET MAUI 中加载 json 文件？

引言:

按core传统方式添加 AddJsonFile("appsettings.json") 在windows平台和ssr工作正常,但是在 ios 和 android 无法用这种方式,因为资源生成方式不一样. 使用内置资源方式不够灵活而且 ios 平台会提示不能复制 json 文件到目录,于是进行了几天的研究,终于能正确使用了.
https://img2022.cnblogs.com/blog/1980213/202211/1980213-20221114193259100-1999902780.png
资源文件夹


[*]官方工程 Resources\Raw\文件夹 AboutAssets.txt 文件说明
您希望与应用程序一起部署的任何原始资产都可以放置在此目录（和子目录）。 将资产部署到您的应用程序, 由 `.csproj` 中的以下 `MauiAsset` 构建操作自动处理。

<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup> <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />

这些文件将与您的包一起部署，并且可以使用 Essentials 访问：

<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>async Task LoadMauiAsset()
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>{
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>using var stream = await FileSystem.OpenAppPackageFileAsync("AboutAssets.txt");
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>using var reader = new StreamReader(stream);

<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>var contents = reader.ReadToEnd();
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>}复制一份txt文件按操作复现成功.

[*]直接丢入 appsettings.json 编译到ios平台提示错误不能复制 json 文件到目录, 经google,找到方案,需要项目文件属性中 Remove 文件
相关错误提示
The path 'XXXXXXX\appsettings.json' would result in a file outside of the app bundle and cannot be used.
The path '..\..\..\..\..\..\..\Repos\BlazorMaui\BlazorMaui\appsettings.json' would result in a file outside of the app bundle and cannot be used.
最终方案:

[*]appsettings.json文件直接放工程根目录
[*]文件属性生成操作为 MauiAsset 和 不复制
[*]需要在项目属性中 Remove 文件
https://img2022.cnblogs.com/blog/1980213/202211/1980213-20221114192755351-2147254704.png
项目文件
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><Content Remove="appsettings.json" />
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup></ItemGroup>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><MauiAsset Include="appsettings.json">
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><CopyToOutputDirectory>Never</CopyToOutputDirectory>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup></MauiAsset>
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup></ItemGroup> 读取配置文件代码
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>async static Task<Stream> LoadMauiAsset()
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>{
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>try
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>{

<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>using var stream = await FileSystem.OpenAppPackageFileAsync("appsettings.json");
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>using var reader = new StreamReader(stream);

<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>var contents = reader.ReadToEnd();
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>Console.WriteLine("OpenAppPackageFileAsync => " + contents);
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>return stream;
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>}
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>catch (Exception e)
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>{
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>Console.WriteLine("OpenAppPackageFileAsync Exception => " + e.Message);
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>}
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>return null;
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup><ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>}附加到 builder.Configuration
var stream = LoadMauiAsset().Result;
builder.Configuration.AddJsonStream(stream);附:使用内置资源方式

需要在项目属性中设置生成操作为嵌入资源
<ItemGroup>
<EmbeddedResource Include="appsettings.json" />
</ItemGroup>代码 BlazorMaui 为工程名
var a = Assembly.GetExecutingAssembly();
using var stream = a.GetManifestResourceStream("BlazorMaui.appsettings.json");
builder.Configuration.AddJsonStream(stream);项目地址

https://github.com/densen2014/BlazorMaui
https://gitee.com/densen2014/BlazorMaui
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