Vnext参数1:不能从“字符串”转换为“的System.IO.Stream” [英] Vnext Argument 1: cannot convert from 'string' to 'System.IO.Stream'
问题描述
我想创建一个通用串行withing一个Vnext项目并当我打电话的构造StreamWriter的它抛出这个编译器错误
错误CS1503参数1:不能从字符串转换为
'的System.IO.Stream'Test.ASP.NET核心5.0 Helper.cs 14
< /块引用>
即使有一个构造函数,允许指定一个文件作为参数的路径。
这是我的类文件
使用系统;
使用System.Collections.Generic;
使用的System.Xml;
使用的System.Xml.Serialization;
:使用System.IO;
命名空间测试
{
公共静态类助手
{
公共静态无效SerializeToXml< T>(字符串路径,T值)
{
无功序列化=新的XmlSerializer(typeof运算(T));错误发生时这里
使用(VAR流=新的StreamWriter(路径))//使用
{
(VAR作家= XmlWriter.Create(流))
{
serializer.Serialize(作家,价值);
}
}
}
}
}
这是我的project.json文件
{
版本:1.0.0- * ,
依赖:{
},
命令:{
运行:在运行
},
框架 :{
aspnet50:{
依赖:{
},
frameworkAssemblies:{
的System.Xml: 4.0.0.0
}
},
aspnetcore50:{
依赖:{
System.Console:4.0。 0-β-22231,
System.Xml.XmlSerializer:4.0.0-β-22231,
System.Collections中:4.0.10-β-22422,
System.Xml.ReaderWriter:4.0.10-β-22231,
System.IO:4.0.10-β-22231
}
}
}
}
解决方案下面从 davidfowl
那是因为它的答案不提供CoreCLR。使用新的
的StringWriter(File.OpenWrite(路径)),而不是
块引用>
有关将来参考我在哪里可以检查一个功能可用?
文件在 https问题:// github上。 COM / DOTNET / corefx 库。他们
就能解释,为什么东西,在新的框架缺失。我
相信辗转这个特殊超载的原因是因为新的软件包之间
分层的问题。
这包含的StreamWriter大会应不直接
引用的FileStream:
块引用>
新的StreamReader(路径)
实际执行
新的StreamReader(新的FileStream(路径选择))。
I am trying to create a generic serializer withing a Vnext project and when I call the constructor for StreamWriter it throws this compiler error
Error CS1503 Argument 1: cannot convert from 'string' to 'System.IO.Stream' Test.ASP.NET Core 5.0 Helper.cs 14
even though there is a constructor that allows to specify a path to a file as an argument.
this is my class file
using System; using System.Collections.Generic; using System.Xml; using System.Xml.Serialization; using System.IO; namespace Test { public static class Helper { public static void SerializeToXml<T>(string path, T value) { var serializer = new XmlSerializer(typeof(T)); using (var stream = new StreamWriter(path)) // ERROR OCCURS HERE { using (var writer = XmlWriter.Create(stream)) { serializer.Serialize(writer, value); } } } } }
This is my project.json file
{ "version": "1.0.0-*", "dependencies": { }, "commands": { "run": "run" }, "frameworks": { "aspnet50": { "dependencies": { }, "frameworkAssemblies": { "System.Xml": "4.0.0.0" } }, "aspnetcore50": { "dependencies": { "System.Console": "4.0.0-beta-22231", "System.Xml.XmlSerializer": "4.0.0-beta-22231", "System.Collections": "4.0.10-beta-22422", "System.Xml.ReaderWriter": "4.0.10-beta-22231", "System.IO": "4.0.10-beta-22231" } } } }
解决方案Here is the Answer from davidfowl
Thats because it's not available on CoreCLR. Use new StringWriter(File.OpenWrite(path)) instead
For future reference where can I check if a function is available or not?
File issues on the https://github.com/dotnet/corefx repository. They will be able to clarify why things are missing in the new framework. I believe the reason this particular overload was removed was because of layering issues between the new packages.
The assembly that contains StreamWriter shouldn't be directly referencing FileStream:
new StreamReader(path)
actually does
new StreamReader(new FileStream(path, options)).
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