无法隐式转换类型'的System.IO.Stream'到'的java.io.InputStream“ [英] Cannot implicitly convert type 'System.IO.Stream' to 'Java.IO.InputStream'
问题描述
我提到了一些类似的问题在左右,但他们没有处理 IO
。
I referred some similar questions on SO but none of them deals with IO
.
我用同样的code在Java中,当我用的Eclipse
。这一次,它的工作。
I had used the same code in java when I used Eclipse
. That time it worked.
但现在我尝试使用这个code。在单声道Android版
(C#),这是行不通的。
But now I try to use this code in Mono for Android
(C#), it doesn't work.
我试图运行此code创建一个的InputStream
:
I'm trying to run this code to create an InputStream
:
InputStream myInput =ctx.Assets.Open(DATABASE_NAME + ".db");
但它给我编译时错误:无法隐式转换类型'的System.IO.Stream'到'的java.io.InputStream
有一个直接的函数从资源文件复制到设备内存,但需要的源和目标路径。
There is a direct function to copy a file from assets to device memory but that requires source and destination path.
如何获得源路径???
我敢绝对的初学者单声道Android版
,任何帮助AP preciated。的
推荐答案
单声道为Android翻译一些Java构建成相当于.NET结构,以缓解.NET类平台之间code共享。作为其中的一部分,的java.io.InputStream
和的java.io.OutputStream
映射到的System.IO.Stream
,所以编译器错误。
Mono for Android translates some Java constructs into "equivalent" .NET constructs to ease code sharing between .NET-like platforms. As part of this, java.io.InputStream
and java.io.OutputStream
are mapped to System.IO.Stream
, hence the compiler errors.
你有什么需要存在于的InputStream
不上的System.IO.Stream
存在吗?
Is there anything you require that exists on InputStream
that doesn't exist on System.IO.Stream
?
有一个直接的函数从资源文件复制到设备内存,但需要的源和目标路径。
There is a direct function to copy a file from assets to device memory but that requires source and destination path.
我不知道的InputStream
方法,你指的是在这里。您可以使用 Stream.CopyTo(流)
来做到这一点:
I have no idea what InputStream
method you're referring to here. You can use Stream.CopyTo(Stream)
to do that:
Stream asset = context.Assets.Open(DATABASE_NAME + ".db");
string dbPath = System.IO.Path.Combine(
System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal),
"YourFile.xml");
using (var dest = System.IO.File.OpenWrite(destPath))
asset.CopyTo(dest);
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