DataException扩展代码,CSharp代码库,德仔网

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【CSharp】 DataException扩展
作者:书于 / 发布于2015/1/12/ 1037

	using System;
	using System.Data;
	using System.Data.SqlClient;

	namespace Smithfield
	{
	 internal static class DataExceptionExtender
	 {
	 /// <summary>
	 /// Raises a user friendly error message.
	 /// </summary>
	 /// <param name="ex">The exception.</param>
	 /// <exception cref="DataException">
	 /// Raises an exception of type <see cref="DataException"/>
	 /// </exception>
	 public static DataException GetDataException(this EntityException ex)
	 {
	 if (ex.InnerException != null)
	 {
	 if (ex.InnerException is SqlException)
	 {
	 GetDataException((SqlException)ex.InnerException);
	 }
	 }
	 return GetDataException(ex, "Data Error:");
	 }

	 /// <summary>
	 /// Raises a user friendly error message.
	 /// </summary>
	 /// <param name="ex">The exception.</param>
	 /// <exception cref="DataException">
	 /// Raises an exception of type <see cref="DataException"/>
	 /// </exception>
	 public static DataException GetDataException(this SqlException ex)
	 {
	 string message = ex.Message;

	 if (message.StartsWith(@"Login failed for user", StringComparison.OrdinalIgnoreCase))
	 {
	 throw new DataException(string.Format("Data Error: Login error for user '{0}'", message.Substring(23, message.IndexOf('\'', 23) - 23)), ex);
	 }

	 return GetDataException(ex, "Data Error:");
	 }

	 /// <summary>
	 /// Converts the supplied <paramref name="exception"/> to a <see cref="DataException"/>
	 /// </summary>
	 /// <param name="exception">The <see cref="Exception"/> to convert.</param>
	 /// <param name="message">The new message prefix.</param>
	 /// <param name="resuseDataException">
	 /// <see langword="true"/> to return the <paramref name="exception"/> if it is of type
	 /// <see cref="DataException"/>, or contains an <see cref="Exception.InnerException"/>
	 /// of type <em>DataException</em>; otherwise, <see langword="false"/> to always throw
	 /// a new <em>DataException</em>.
	 /// </param>
	 /// <returns>
	 /// A <see cref="DataException"/> that wraps the supplied <paramref name="exception"/>.
	 /// </returns>
	 /// <remarks>
	 /// If <paramref name="resuseDataException"/> and <paramref name="exception"/>
	 /// is a <see cref="DataException"/> or has a <em>DataException</em>
	 /// <see cref="Exception.InnerException"/> then that is returned rather than generating
	 /// a new <em>DataException</em>. In this case the <paramref name="message"/> prefix is ignored.
	 /// </remarks>
	 public static DataException GetDataException(this Exception exception, string message, bool resuseDataException = true)
	 {
	 Exception exRoot;

	 if (resuseDataException)
	 {
	 exRoot = GetRootException(exception);

	 if (exRoot is DataException)
	 {
	 return (DataException)exRoot;
	 }
	 }
	 else
	 {
	 exRoot = exception;
	 }

	 if (!string.IsNullOrWhiteSpace(message))
	 return new DataException(string.Format("{0} => {1}", message, exRoot.Message), exception);

	 return new DataException(exRoot.Message, exception);
	 }

	 private static Exception GetRootException(Exception ex)
	 {
	 return ex.InnerException != null ? GetRootException(ex.InnerException) : ex;
	 }
	 }
	}
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