C# ExceptionExtensions 系统异常扩展类

using System;
using System.Collections.Generic;
using System.Data.Entity.Validation;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSFramework.Workflow.Core.Extension
{
    /// <summary>
    /// 系统异常扩展类
    /// </summary>
    public static partial class ExceptionExtensions
    {
        /// <summary>
        /// 扩展方法：获取异常信息
        /// </summary>
        /// <param name="ex">异常实例</param>
        /// <param name="showStackTrace">获取堆栈信息</param>
        /// <returns></returns>
        public static string GetMessage(this Exception ex, bool showStackTrace = false)
        {
            StringBuilder sb = new StringBuilder();
            GetExceptionMessage(ex, sb, showStackTrace, "");
            return sb.ToString();
        }

        public static string GetMessage(this DbEntityValidationException ex)
        {
            //System.Data.Entity.Validation.DbEntityValidationException:
            //“Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.”
            //获取校验错误信息
            StringBuilder sb = new StringBuilder();
            foreach (DbEntityValidationResult err in ex.EntityValidationErrors)
            {
                sb.AppendLine("实体:" + err.Entry.Entity.GetType().FullName);
                foreach (var x in err.ValidationErrors)
                {
                    sb.AppendLine(x.ErrorMessage);
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// 获取AggregateException异常信息
        /// </summary>
        /// <param name="ex">异常实例</param>
        /// <param name="showStackTrace">获取堆栈信息</param>
        /// <returns></returns>
        public static string GetExceptionMessage(AggregateException ex, bool showStackTrace = false)
        {
            StringBuilder sb = new StringBuilder();

            sb.AppendLine("【异常类型】∶" + ex.GetType().Name);
            sb.AppendLine("【异常信息】:" + ex.Message);
            sb.AppendLine("【异常方法】:" + ex.TargetSite);

            if (showStackTrace)
                sb.AppendLine("【堆栈调用】:" + ex.StackTrace);

            //内部异常
            if (ex.InnerException != null)
            {
                sb.AppendLine("【InnerException】:" + ex.InnerException.Message);

                if (ex.InnerException.InnerException != null)
                    sb.AppendLine(ex.InnerException.InnerException.Message);

            }

            //多个内部异常
            if (ex.InnerExceptions != null && ex.InnerExceptions.Count > 0)
            {
                foreach (var e in ex.InnerExceptions)
                {
                    sb.AppendLine(e.GetType().Name + "----------");
                    sb.AppendLine(GetExceptionMessage(e));
                }
            }

            return sb.ToString();
        }

        /// <summary>
        /// 获取异常信息
        /// </summary>
        /// <param name="ex">异常实例</param>
        /// <param name="showStackTrace">获取堆栈信息</param>
        /// <param name="Prefix"></param>
        /// <returns></returns>
        public static string GetExceptionMessage(Exception ex, bool showStackTrace = false, string Prefix = "")
        {
            StringBuilder sb = new StringBuilder();

            sb.AppendLine(Prefix + "【异常类型】∶" + ex.GetType().Name);
            sb.AppendLine(Prefix + "【异常信息】:" + ex.Message);
            sb.AppendLine(Prefix + "【异常方法】:" + ex.TargetSite);

            if (showStackTrace)
                sb.AppendLine(Prefix + "【堆栈调用】:" + ex.StackTrace);

            //内部异常
            if (ex.InnerException != null)
            {
                sb.AppendLine(Prefix + "【InnerException】:" + ex.InnerException.Message);

                if (ex.InnerException.InnerException != null)
                    sb.AppendLine(ex.InnerException.InnerException.Message);

            }
            return sb.ToString();
        }

        /// <summary>
        /// 获取异常信息
        /// </summary>
        /// <param name="ex"></param>
        /// <param name="sb"></param>
        /// <param name="showStackTrace">获取堆栈信息</param>
        /// <param name="Prefix">前缀</param>
        public static void GetExceptionMessage(Exception ex, StringBuilder sb, bool showStackTrace = false, string Prefix = "")
        {
            sb.Append(GetExceptionMessage(ex, showStackTrace, Prefix));
        }
    }
}

            try
            {
                //省略代码
            }
            catch (DbEntityValidationException ex)
            {
                var msg = ex.GetMessage();//获取异常消息
                throw new Exception(msg);
            }
            catch (Exception ex)
            {
                var msg = ex.GetMessage();//获取异常消息
                throw new Exception(msg);
            }