详解C#常见应用函数的实例总结(2)-木庄网络博客

当前第2页返回上一页

using System.Text.RegularExpressions;
/// <summary>
/// 清除文本HTML码
/// </summary>
public string RemoveHtmlTag(string htmlStr)
{
  if (string.IsNullOrEmpty(htmlStr))
    return string.Empty;
  return Regex.Replace(htmlStr, @"<[^>]*>", "");
}

5、反射通过类名创建类实例

using System.Reflection;
/// <summary>
/// 反射 通过类名创建类实例
/// </summary>
public void ReflecTest()
{
  Object objClass = Assembly.GetExecutingAssembly().CreateInstance("MyStudy.BLL.BookInfoBLL"); //参数：类的完全限定名，无需类的后缀名
  if (objClass != null)
  {
    BookInfoBLL bll = (BookInfoBLL)objClass;
  }
}

6、货币类型转换

/// <summary>
/// 货币
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static string ToMoney(object obj)
{
  return String.Format("{0:C}", obj);
}

7、小数点位数

//1.小数点位数
string str1 = String.Format("{0:F1}", 56789); //result: 56789.0
string str2 = String.Format("{0:F2}", 56789); //result: 56789.00
string str3 = String.Format("{0:N1}", 56789); //result: 56,789.0
string str4 = String.Format("{0:N2}", 56789); //result: 56,789.00
string str5 = String.Format("{0:N3}", 56789); //result: 56,789.000
string str6 = (56789 / 100.0).ToString("#.##"); //result: 567.89
string str7 = (56789 / 100).ToString("#.##"); //result: 567
//2.保留N位,四舍五入 .
decimal d= decimal.Round(decimal.Parse("0.55555"),2);
//3.保留N位四舍五入
Math.Round(0.55555, 2);

8、使用TryGetValue改善获取字典值得性能

使用TryGetValue在大量取值时性能比ContainsKey提高一倍。

Dictionary<int, String> dic = new Dictionary<int, String>();
dic.Add(1,"张三");
dic.Add(2,"李四");
string name = "";
//错误写法，效率底
if (dic.ContainsKey(1))
{
  name = dic[1];
  Console.WriteLine(name);
}
//正确写法，效率提高一倍
if (dic.TryGetValue(1, out name))
{
  Console.WriteLine(name);
}