代码
/// <summary> 断言器,用于判断和抛出异常
/// </summary>
static class Assertor
{
/// <summary> 如果value值是null 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreNull(object value, string name)
{
if (value == null)
{
throw new ArgumentNullException(name, "参数不能为null");
}
}/// <summary> 如果value字符串是null或string.Empty 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreNullOrEmpty(string value, string name)
{
if (value == null || value.Length == 0)
{
throw new ArgumentNullException(name, "字符串不能为null或空");
}
}/// <summary> 如果value字符串是 null、空还是仅由空白字符组成 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreNullOrWhiteSpace(string value, string name)
{
if (string.IsNullOrWhiteSpace(value))
{
throw new ArgumentNullException(name, "字符串不能为null或连续空白");
}
}/// <summary> 如果value集合是null或者Count是0 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreNullOrEmpty(ICollection value, string name)
{
if (value == null || value.Count == 0)
{
throw new ArgumentNullException(name, "集合不能为null且必须有元素");
}
}/// <summary> 如果value值超过min~max 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
public static void AreInRange<T>(T value, string name, T min, T max)
where T : IComparable<T>
{
if (value.CompareTo(min) < 0 || value.CompareTo(max) > 0)
{
throw new ArgumentOutOfRangeException(name, value, "值不能大于" + max + "或小于" + min);
}
}/// <summary> 如果value值超过min~max 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
public static void AreInRange<T>(IComparable value, string name, T min, T max)
where T : IComparable
{
if (value.CompareTo(min) < 0 || value.CompareTo(max) > 0)
{
throw new ArgumentOutOfRangeException(name, value, "值不能大于" + max + "或小于" + min);
}
}/// <summary> 如果value不是T类型或其子类 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreType<T>(object value, string name)
{
if (value is T == false)
{
throw new ArgumentOutOfRangeException(name, value + " 值不是指定的类型 ‘" + typeof(T) + "‘");
}
}/// <summary> 如果value不是Type类型或其子类 则抛出异常
/// </summary>
/// <param name="type">限定类型</param>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreType(Type type, object value, string name)
{
if (type.IsInstanceOfType(value) == false)
{
throw new ArgumentOutOfRangeException(name, value + " 值不是指定的类型 ‘" + type + "‘");
}
}/// <summary> 如果value不是数字类型 则抛出异常
/// </summary>
/// <param name="value">参数值</param>
/// <param name="name">参数名称</param>
public static void AreNumberType(object value, string name)
{
var conv = value as IConvertible;
if (conv == null)
{
var code = (int)conv.GetTypeCode();
if (code < 5 || code > 15)
{
throw new ArgumentOutOfRangeException(name, value + "不是数字类型");
}
}
}/// <summary> 如果condition是true 则抛出异常
/// </summary>
/// <param name="condition">判断条件</param>
/// <param name="message">异常消息</param>
public static void AreTrue<T>(bool condition, string message)
where T : Exception, new()
{
if (condition)
{
var ex = new T();
var lit = Literacy.Cache(typeof(Exception), false);
lit.Load.NonPublicField();
lit.Field["_message"].SetValue(ex, message);
throw ex;
}
}/// <summary> 如果condition是false 则抛出异常
/// </summary>
/// <param name="condition">判断条件</param>
/// <param name="message">异常消息</param>
public static void AreFalse<T>(bool condition, string message)
where T : Exception, new()
{
AreTrue<T>(!condition, message);
}/// <summary> 如果condition是true 则抛出NotSupportedException异常
/// </summary>
/// <param name="condition">判断条件</param>
/// <param name="message">异常消息</param>
public static void AreTrue(bool condition, string message)
{
AreTrue<NotSupportedException>(condition, message);
}/// <summary> 如果condition是false 则抛出NotSupportedException异常
/// </summary>
/// <param name="condition">判断条件</param>
/// <param name="message">异常消息</param>
public static void AreFalse(bool condition, string message)
{
AreTrue<NotSupportedException>(!condition, message);
}
}
调用
private static SimpleCache<IComponentFactory> GetFactoryCache()
{
return new SimpleCache<IComponentFactory>(true, key => {
IComponentFactory factory;
var provider = _ProvideCache[key];
if (provider == DBProvider.Other)
{
var type = Type.GetType(key, false, false);
Assertor.AreTrue<NotSupportedException>(type == null, "没有找到名为" + key + "的类型");
factory = Activator.CreateInstance(type) as IComponentFactory;
Assertor.AreTrue<NotSupportedException>(factory == null, type.FullName + "无法实例化或没有继承IComponentFactory");
}
else
{
factory = ComponentFactory.Create(provider);
}
return factory;
});
}
CodeCSDN
https://code.csdn.net/snippets/389206