我不确定如何使用isNullorWhiteSpace将自己的方法合并到代码中,我的框架不是4.0。我以前有过一些帮助,他们建议使用isnullorwhitespace
,这不是最适合展示的方法:
2/20/2014 7:33:10 AM,测量速度:0.2225
我似乎无法找到可行的等效代码。
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Collections;
namespace conApp
{
class Program
{
public static class StringExtensions
{
public static bool IsNullOrWhiteSpace(string value)
{
if (value != null)
{
for (int i = 0; i < value.Length; i++)
{
if (!char.IsWhiteSpace(value[i]))
{
return false;
}
}
}
return true;
}
}
static void Main(string[] args)
{
String line;
try
{
using (StreamWriter sw = new StreamWriter("C:\\writetest\\writetest.txt"))
{
string mydirpath = "C:\\chat\\";
string[] txtFileList = Directory.GetFiles(mydirpath, "*.txt");
foreach (string txtName in txtFileList)
{
System.IO.StreamReader sr = new System.IO.StreamReader(txtName);
while ((line = sr.ReadLine()) != null)
{
String spart = ".prt";
String sam = " AM";
String spm = " PM";
String sresult = "TEST RESULT: ";
String svelocity = "MEASURED VELOCITY: ";
String part = string.Empty;
String date = string.Empty;
String result = string.Empty;
String velocity = string.Empty;
// sw.WriteLine(line);
if (line.Contains(sam) || line.Contains(spm))
{
date = line;
}
if (line.Contains(spart))
{
part = line;
}
if (line.Contains(sresult))
{
result = line;
}
if (line.Contains(svelocity))
{
velocity = line;
}
if (!String.IsNullOrWhiteSpace(date) && !String.IsNullOrWhiteSpace(velocity))
{
bool isNullOrWhiteSpace = "foo bar".IsNullOrWhiteSpace(); //doesnt work here
int I = 2;
string[] x = new string[I];
x[0] = date;
x[1] = velocity;
sw.WriteLine(x[0] + "," + x[1]);
}
}
}
}
}
catch
{
}
}
}
}
答案 0 :(得分:4)
首先,StringExtensions
需要是顶级课程,所以它不能在另一个课程中
其次,您需要通过将this
关键字添加到第一个参数来将方法转换为扩展方法:
public static bool IsNullOrWhiteSpace(this string value)
所以它变成了:
public static class StringExtensions
{
public static bool IsNullOrWhiteSpace(this string value)
{
if (value != null) {
for (int i = 0; i < value.Length; i++) {
if (!char.IsWhiteSpace(value[i])) {
return false;
}
}
}
return true;
}
}
class Program
{
...
}