1.异常处理代码：
/// <summary>
/// 为参数验证提供有用的方法
/// </summary>
public static class ArgumentValidator
{
/// <summary>
/// 如果argumentToValidate为空，则抛出一个ArgumentNullException异常
/// </summary>
public static void ThrowIfNull(object argumentToValidate, string argumentName)
{
if (null == argumentName)
{
throw new ArgumentNullException("argumentName");
}
if (null == argumentToValidate)
{
throw new ArgumentNullException(argumentName);
}
}
/// <summary>
/// 如果argumentToValidate为空，则抛出一个ArgumentException异常
/// </summary>
public static void ThrowIfNullOrEmpty(string argumentToValidate, string argumentName)
{
ThrowIfNull(argumentToValidate, argumentName);
if (argumentToValidate == string.Empty)
{
throw new ArgumentException(argumentName);
}
}
/// <summary>
/// 如果condition为真，则抛出ArgumentException异常
/// </summary>
/// <param name="condition"></param>
/// <param name="msg"></param>
public static void ThrowIfTrue(bool condition, string msg)
{
ThrowIfNullOrEmpty(msg, "msg");
if (condition)
{
throw new ArgumentException(msg);
}
}
/// <summary>
/// 如果指定目录存在该文件则抛出FileNotFoundException异常
/// </summary>
/// <param name="fileSytemObject"></param>
/// <param name="argumentName"></param>
public static void ThrowIfDoesNotExist(FileSystemInfo fileSytemObject, String argumentName)
{
ThrowIfNull(fileSytemObject, "fileSytemObject");
ThrowIfNullOrEmpty(argumentName, "argumentName");
if (!fileSytemObject.Exists)
{
throw new FileNotFoundException("'{0}' not found".Fi(fileSytemObject.FullName));
}
}
public static string Fi(this string format, params object[] args)
{
return FormatInvariant(format, args);
}
/// <summary>
/// 格式化字符串和使用<see cref="CultureInfo.InvariantCulture">不变的文化</see>.
/// </summary>
/// <remarks>
/// <para>这应该是用于显示给用户的任何字符串时使用的“B”>“B”>“”。它意味着日志
///消息，异常消息，和其他类型的信息，不使其进入用户界面，或不会
///无论如何，对用户都有意义；）.</para>
/// </remarks>
public static string FormatInvariant(this string format, params object[] args)
{
ThrowIfNull(format, "format");
return 0 == args.Length ? format : string.Format(CultureInfo.InvariantCulture, format, args);
}
/// <summary>
/// 如果时间不为DateTimeKind.Utc，则抛出ArgumentException异常
/// </summary>
/// <param name="argumentToValidate"></param>
/// <param name="argumentName"></param>
public static void ThrowIfNotUtc(DateTime argumentToValidate, String argumentName)
{
ThrowIfNullOrEmpty(argumentName, "argumentName");
if (argumentToValidate.Kind != DateTimeKind.Utc)
{
throw new ArgumentException("You must pass an UTC DateTime value", argumentName);
}
}
}
