C#之项目常用方法之静态扩展

　　一般项目中我们经常用到数据Json的序列化与反序列化，为了方便在需要的地方快速使用，一般建议都封装为静态扩展方法，在需要的地方可直接使用。

　　而目前C#项目中序列化一般都是用的 Newtonsoft.Json 来做的，因此这里贴出通用静态扩展方法供大家参考。

PS：若要添加此扩展方法，必须得在Nuget包中添加  Newtonsoft.Json  的引用。

using System;
using System.Collections.Generic;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;

namespace DemoFrame_Basic.Extensions
{
/// <summary>
/// 静态帮助类
/// </summary>
public static class ObjStrExtension
{
/// <summary>
/// 返回Json字符串
/// </summary>
/// <param name="obj">需要序列化的对象  例:T.ToJson()</param>
/// <param name="isNullValueHandling">是否忽略Null字段，最终字符串中是否包含Null字段</param>
/// <param name="indented">是否展示为具有Json格式的字符串</param>
/// <param name="isLowCase">是否忽略大小写</param>
/// <param name="dateTimeFormat">时间转换格式</param>
/// <returns>Json字符串</returns>
public static string ToJson(this object obj, bool isNullValueHandling = false, bool indented = false, bool isLowCase = false, string dateTimeFormat = "yyyy-MM-dd HH:mm:ss")
{
var options = new JsonSerializerSettings();

if (indented)
options.Formatting = Formatting.Indented;
if (isLowCase)
{
options.ContractResolver = new CamelCasePropertyNamesContractResolver();
}
if (isNullValueHandling)
options.NullValueHandling = NullValueHandling.Ignore;
options.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
options.Converters = new List<JsonConverter> { new IsoDateTimeConverter { DateTimeFormat = dateTimeFormat } };
return obj.ToJson(options);
}
/// <summary>
/// Json字符串
/// </summary>
/// <param name="obj">需要序列化的对象  例:T.ToJson(settings)</param>
/// <param name="settings">Json序列化设置</param>
/// <returns>Json字符串</returns>
public static string ToJson(this object obj, JsonSerializerSettings settings)
{
return JsonConvert.SerializeObject(obj, settings);
}
/// <summary>
/// 返回相关设定格式字符串
/// </summary>
/// <param name="obj"></param>
/// <param name="format">格式 例：yyyy-MM-dd HH:mm:ss</param>
/// <returns>设定格式字符串</returns>
public static string ToDateTimeString(this object obj, string format)
{
DateTime.TryParse(obj?.ToString(), out var dateTime);
return dateTime.ToString(format);
}
/// <summary>
/// 得到字符串的Byte
/// </summary>
/// <param name="str"></param>
/// <returns>Byte</returns>
public static byte[] GetBytes(this string str)
{
if (string.IsNullOrEmpty(str))
return default(byte[]);
return Encoding.UTF8.GetBytes(str);
}

public static bool ToBool(this string str, bool defaultValue = false)
{
bool.TryParse(str, out defaultValue);
return defaultValue;
}

public static short ToShort(this string str, short defaultValue = 0)
{
short.TryParse(str, out defaultValue);
return defaultValue;
}

public static int ToInt(this string str, int defaultValue = 0)
{
int.TryParse(str, out defaultValue);
return defaultValue;
}

public static long ToLong(this string str, long defaultValue = 0)
{
long.TryParse(str, out defaultValue);
return defaultValue;
}

public static double ToDouble(this string str, double defaultValue = 0)
{
double.TryParse(str, out defaultValue);
return defaultValue;
}

public static TEnum ToEnum<TEnum>(this string str, bool ignoreCase = true, TEnum defaultValue = default(TEnum)) where TEnum : struct
{
Enum.TryParse(str, ignoreCase, out defaultValue);
return defaultValue;
}

public static T ToNetType<T>(this string str, bool isIgnoreNull = true, bool isIgnoreEx = false)
{
var setting = new JsonSerializerSettings
{
NullValueHandling = isIgnoreNull ? NullValueHandling.Ignore : NullValueHandling.Include
};
try
{
if (string.IsNullOrEmpty(str))
{
return default(T);
}
else if ("\"\"" == str)
{
return default(T);
}
else
{
return JsonConvert.DeserializeObject<T>(str, setting);
}
}
catch (Exception)
{
if (!isIgnoreEx)
throw;
return default(T);
}
}

public static T ToNetType<T>(this string str, JsonSerializerSettings settings)
{
try
{
if (string.IsNullOrEmpty(str))
{
return default(T);
}
else if ("\"\"" == str)
{
return default(T);
}
else
{
return JsonConvert.DeserializeObject<T>(str, settings);
}
}
catch (Exception)
{

return default(T);
}
}

/// <summary>
/// 比较是否相等，忽略大小写
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool EqualsIgnoreCase(this string a, string b)
{
if (a != null)
return a.Equals(b, StringComparison.CurrentCultureIgnoreCase);
return b == null;
}
}
}