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@@ -0,0 +1,193 @@
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+using System;
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+using System.Text.RegularExpressions;
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+
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+namespace Extensions
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+{
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+ public static class stringExtension
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+ {
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+ public static T ToJson<T>(this string obj)
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+ {
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+ return Newtonsoft.Json.JsonConvert.DeserializeObject<T>(obj);
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+ }
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+ public static bool IsNullOrEmpty(this string @this)
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+ {
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+ return string.IsNullOrEmpty(@this);
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+ }
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+ public static Nullable<T> ToNullable<T>(this string @this) where T:struct
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+ {
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+ if (string.IsNullOrWhiteSpace(@this)) return null;
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+ var val=Convert.ChangeType(@this, typeof(T));
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+ return (T)val;
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+ }
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+ public static bool IsNotNullOrEmpty(this string @this)
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+ {
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+ return !string.IsNullOrEmpty(@this);
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+ }
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+
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+ public static bool IsNullOrWhitespace(this string @this)
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+ {
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+ return string.IsNullOrWhiteSpace(@this);
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+ }
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+
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+ public static bool IsNotNullOrWhitespace(this string @this)
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+ {
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+ return !string.IsNullOrWhiteSpace(@this);
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+ }
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+
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+ public static string IfNullOrEmpty(this string @this, string defaultVal)
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+ {
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+ return string.IsNullOrEmpty(@this) ? defaultVal : @this;
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+ }
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+
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+ public static string IfNullOrWhitespace(this string @this, string defaultVal)
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+ {
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+ return string.IsNullOrWhiteSpace(@this) ? defaultVal : @this;
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+ }
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+
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+ public static string ClearWhitespace(this string @this)
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+ {
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+ if (string.IsNullOrWhiteSpace(@this)) return string.Empty;
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+ return @this.Replace(" ", string.Empty);
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+ }
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+
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+ public static string Left(this string @this, int length)
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+ {
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+ if (string.IsNullOrEmpty(@this)) return string.Empty;
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+ return @this.Length < length ? @this : @this.Substring(0, length);
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+ }
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+
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+ public static string Rigth(this string @this, int length)
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+ {
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+ if (string.IsNullOrEmpty(@this)) return string.Empty;
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+ return @this.Length < length ? @this : @this.Substring(@this.Length - length);
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+ }
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+
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+ public static string TrimToMaxLength(this string @this, int maxLength, string suffix = "")
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+ {
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+ return ((@this == null || @this.Length <= maxLength) ? @this : string.Concat(@this.Substring(0, maxLength), suffix));
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+ }
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+
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+ public static T To<T>(this string @this)
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+ {
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+ return To(@this, default(T));
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+ }
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+
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+ public static T To<T>(this string @this, T defaultValue)
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+ {
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+ if (string.IsNullOrWhiteSpace(@this))
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+ return defaultValue;
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+
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+ T retVal = defaultValue;
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+ try
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+ {
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+ //获取要转换的目标类型
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+ Type targetType = typeof(T);
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+
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+ //对 Guid 类型的值进行单独处理
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+ if (targetType == typeof(Guid))
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+ retVal = (T)((object)(new Guid(@this)));
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+ //对 Enum 类型的值进行单独处理
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+ else if (targetType.BaseType == typeof(Enum))
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+ retVal = (T)Enum.Parse(targetType, @this);
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+ else
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+ retVal = (T)Convert.ChangeType(@this, targetType);
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+ }
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+ catch { }
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+
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+ return retVal;
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+ }
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+
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+ public static string GetBefore(this string value, string x)
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+ {
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+ if (value == null || x == null)
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+ return string.Empty;
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+
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+ int xPos = value.IndexOf(x);
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+ return xPos == -1 ? string.Empty : value.Substring(0, xPos);
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+ }
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+
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+ public static string GetAfter(this string value, string x)
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+ {
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+ if (value == null || x == null)
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+ return string.Empty;
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+
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+ int xPos = value.LastIndexOf(x);
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+ if (xPos == -1)
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+ return string.Empty;
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+
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+ int startIndex = xPos + x.Length;
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+ return startIndex >= value.Length ? string.Empty : value.Substring(startIndex);
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+ }
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+
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+ public static string GetBetween(this string value, string x, string y)
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+ {
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+ if (value == null || x == null || y == null)
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+ return string.Empty;
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+
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+ int xPos = value.IndexOf(x);
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+ int yPos = value.LastIndexOf(y);
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+
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+ if (xPos == -1 || yPos == -1)
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+ return string.Empty;
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+
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+ int startIndex = xPos + x.Length;
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+ return startIndex >= yPos ? string.Empty : value.Substring(startIndex, yPos - startIndex);
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+ }
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+
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+ public static string FormatWith(this string @this, Object arg0)
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+ {
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+ return string.Format(@this, arg0);
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+ }
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+
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+ public static string FormatWith(this string @this, Object arg0, Object arg1)
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+ {
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+ return string.Format(@this, arg0, arg1);
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+ }
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+
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+ public static string FormatWith(this string @this, Object arg0, Object arg1, Object arg2)
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+ {
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+ return string.Format(@this, arg0, arg1, arg2);
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+ }
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+
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+ public static string FormatWith(this string @this, params object[] values)
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+ {
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+ return string.Format(@this, values);
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+ }
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+
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+ public static string[] Split(this string @this, string separator, StringSplitOptions option = StringSplitOptions.None)
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+ {
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+ return @this.Split(new[] { separator }, option);
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+ }
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+
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+ public static Boolean IsMatch(this string input, string pattern)
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+ {
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+ return Regex.IsMatch(input, pattern);
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+ }
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+
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+ public static Boolean IsMatch(this string input, string pattern, RegexOptions options)
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+ {
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+ return Regex.IsMatch(input, pattern, options);
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+ }
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+
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+ public static Match Match(this string input, string pattern)
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+ {
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+ return Regex.Match(input, pattern);
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+ }
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+
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+ public static Match Match(this string input, string pattern, RegexOptions options)
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+ {
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+ return Regex.Match(input, pattern, options);
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+ }
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+
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+ public static MatchCollection Matches(this string input, string pattern)
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+ {
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+ return Regex.Matches(input, pattern);
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+ }
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+
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+ public static MatchCollection Matches(this string input, string pattern, RegexOptions options)
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+ {
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+ return Regex.Matches(input, pattern, options);
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+ }
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+ }
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+}
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+
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wyq