using System; using System.Linq; using System.Text; namespace Admin.Core { public static class StringExtensions { /// /// 判断字符串是否为Null、空 /// /// /// public static bool IsNull(this string s) { return string.IsNullOrWhiteSpace(s); } /// /// 判断字符串是否不为Null、空 /// /// /// public static bool NotNull(this string s) { return !string.IsNullOrWhiteSpace(s); } /// /// 与字符串进行比较,忽略大小写 /// /// /// /// public static bool EqualsIgnoreCase(this string s, string value) { return s.Equals(value, StringComparison.OrdinalIgnoreCase); } /// /// 首字母转小写 /// /// /// public static string FirstCharToLower(this string s) { if (string.IsNullOrEmpty(s)) return s; string str = s.First().ToString().ToLower() + s.Substring(1); return str; } /// /// 首字母转大写 /// /// /// public static string FirstCharToUpper(this string s) { if (string.IsNullOrEmpty(s)) return s; string str = s.First().ToString().ToUpper() + s.Substring(1); return str; } /// /// 转为Base64,UTF-8格式 /// /// /// public static string ToBase64(this string s) { return s.ToBase64(Encoding.UTF8); } /// /// 转为Base64 /// /// /// 编码 /// public static string ToBase64(this string s, Encoding encoding) { if (s.IsNull()) return string.Empty; var bytes = encoding.GetBytes(s); return bytes.ToBase64(); } } }