[英]C# StreamWriter , write to a file from different class?
如何写不同类的文件?
public class gen
{
public static string id;
public static string m_graph_file;
}
static void Main(string[] args)
{
gen.id = args[1];
gen.m_graph_file = @"msgrate_graph_" + gen.id + ".txt";
StreamWriter mgraph = new StreamWriter(gen.m_graph_file);
process();
}
public static void process()
{
<I need to write to mgraph here>
}
将StreamWriter mgraph
给您的process()
方法
static void Main(string[] args)
{
// The id and m_graph_file fields are static.
// No need to instantiate an object
gen.id = args[1];
gen.m_graph_file = @"msgrate_graph_" + gen.id + ".txt";
StreamWriter mgraph = new StreamWriter(gen.m_graph_file);
process(mgraph);
}
public static void process(StreamWriter sw)
{
// use sw
}
但是,您的代码有一些难以理解的要点:
gen
类。 这些var在gen的所有实例之间共享。 如果这是一个令人讨厌的目标,那么没问题,但是我有点困惑。 例如,在您的gen类中(或在另一个类中),您可以编写对同一文件起作用的方法,因为该文件名在gen类中是静态的
public static void process2()
{
using(StreamWriter sw = new StreamWriter(gen.m_graph_file))
{
// write your data .....
// flush
// no need to close/dispose inside a using statement.
}
}
您可以将StreamWriter对象作为参数传递。 或者,您可以在流程方法中创建一个新实例。 我还建议将您的StreamWriter包装在using
:
public static void process(StreamWriter swObj)
{
using (swObj)) {
// Your statements
}
}
当然,您可以简单地使用如下的“处理”方法:
public static void process()
{
// possible because of public class with static public members
using(StreamWriter mgraph = new StreamWriter(gen.m_graph_file))
{
// do your processing...
}
}
但是从设计的角度来看,这更有意义(编辑:完整代码):
public class Gen
{
// you could have private members here and these properties to wrap them
public string Id { get; set; }
public string GraphFile { get; set; }
}
public static void process(Gen gen)
{
// possible because of public class with static public members
using(StreamWriter mgraph = new StreamWriter(gen.GraphFile))
{
sw.WriteLine(gen.Id);
}
}
static void Main(string[] args)
{
Gen gen = new Gen();
gen.Id = args[1];
gen.GraphFile = @"msgrate_graph_" + gen.Id + ".txt";
process(gen);
}
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