private object CreateInstance(Type type, string[] args)
{
ConstructorInfo[] infoArray = type.GetConstructors();
List <ParameterInfo[]> matched = new List <ParameterInfo[]>(infoArray.Length);
foreach (var con in infoArray)
{
ParameterInfo[] pArray = con.GetParameters();
if (pArray.Length == args.Length)
{
matched.Add(pArray);
}
}
if (matched.Count <= 0)
{
throw new ApplicationException("Can't find the constructor with " + args.Length + " parameter(s) of type '" + type.AssemblyQualifiedName + "'");
}
StringBuilder sb = new StringBuilder();
int j = 1;
foreach (var paramArray in matched)
{
try
{
object[] realArgs = new object[paramArray.Length];
for (int i = 0; i < paramArray.Length; i++)
{
realArgs[i] = DataConvertor.GetValueByType(paramArray[i].ParameterType, args[i], null, null);
}
return(Activator.CreateInstance(type, realArgs));
}
catch (Exception ex)
{
sb.AppendLine(j + ". " + ex.Message);
}
j++;
}
throw new ApplicationException("There are " + matched.Count + " matched constructor(s), but all failed to construct instance for type '" + type.AssemblyQualifiedName + "', detail error message: \r\n" + sb);
}
private static object Convert(Type sourceType, Type targetType, object source, bool propertyNameIgnoreCase, string columnName, string propertyName, List <string> ignoreTargetProperties)
{
if (source != null && sourceType != source.GetType())
{
sourceType = source.GetType();
}
while (source != null && sourceType.IsGenericType && sourceType.GetGenericTypeDefinition() == typeof(Nullable <>) &&
sourceType.GetGenericArguments() != null &&
sourceType.GetGenericArguments().Length == 1)
{
if ((bool)Invoker.PropertyGet(sourceType, source, "HasValue", false, true))
{
source = Invoker.PropertyGet(sourceType, source, "Value", false, true);
}
else
{
source = null;
}
sourceType = sourceType.GetGenericArguments()[0];
} // 通过循环找出源数据的真实类型（Nullable<>里的泛型参数类型）
// 1. 为空
if (source == null || source == DBNull.Value) // 对象实例为空
{
return(typeof(DataConvertor).GetMethod("GetDefaultValue", BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(targetType).Invoke(null, null));
}
// 2. 为简单类型或object
TypeCode s_Code = Type.GetTypeCode(sourceType);
TypeCode t_Code = Type.GetTypeCode(targetType);
// enum的TypeCode为TypeCode.Int32
if (s_Code != TypeCode.Object || t_Code != TypeCode.Object ||
sourceType == typeof(object) || targetType == typeof(object))
{
return(DataConvertor.GetValueByType(targetType, source, columnName, propertyName));
}
// 3. 为实现了IDictionary<TKey, TValue>接口的集合
if (targetType.IsGenericType && targetType.GetGenericArguments().Length == 2 &&
typeof(IDictionary <int, int>).IsAssignableFrom(targetType.GetGenericTypeDefinition().MakeGenericType(typeof(int), typeof(int))) &&
sourceType.IsGenericType && sourceType.GetGenericArguments().Length == 2 &&
typeof(IDictionary <int, int>).IsAssignableFrom(sourceType.GetGenericTypeDefinition().MakeGenericType(typeof(int), typeof(int)))
)
{
object dictionary = Invoker.CreateInstance(targetType);
Type target_key_type = targetType.GetGenericArguments()[0];
Type target_value_type = targetType.GetGenericArguments()[1];
Type source_key_type = sourceType.GetGenericArguments()[0];
Type source_value_type = sourceType.GetGenericArguments()[1];
IEnumerable iterator = (IEnumerable)source;
foreach (object x in iterator)
{
Type xType = x.GetType();
object source_key = xType.GetProperty("Key").GetGetMethod().Invoke(x, new object[0]);
object source_value = xType.GetProperty("Value").GetGetMethod().Invoke(x, new object[0]);
object target_key = Convert(source_key_type, target_key_type, source_key, propertyNameIgnoreCase, columnName, propertyName, new List <string>(0));
object target_value = Convert(source_value_type, target_value_type, source_value, propertyNameIgnoreCase, columnName, propertyName, new List <string>(0));
Invoker.MethodInvoke(dictionary, "Add", target_key, target_value);
}
return(dictionary);
}
// 4. 为List<T>集合
if (targetType.IsGenericType && targetType.GetGenericArguments().Length == 1 &&
typeof(ICollection <int>).IsAssignableFrom(targetType.GetGenericTypeDefinition().MakeGenericType(typeof(int))) &&
sourceType.IsGenericType && sourceType.GetGenericArguments().Length == 1 &&
typeof(IEnumerable <int>).IsAssignableFrom(sourceType.GetGenericTypeDefinition().MakeGenericType(typeof(int)))
)
{
object list = Invoker.CreateInstance(targetType);
Type listType = targetType.GetGenericArguments()[0];
Type s_eType = sourceType.GetGenericArguments()[0];
IEnumerable iterator = (IEnumerable)source;
IList iList = list as IList;
if (iList == null)
{
return(null);
}
foreach (object x in iterator)
{
object obj = Convert(s_eType, listType, x, propertyNameIgnoreCase, columnName, propertyName, new List <string>(0));
iList.Add(obj);
}
return(iList);
}
// 5. 为非集合的复杂类型
PropertyInfo[] sourceProArray = sourceType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
PropertyInfo[] targetProArray = targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
object target = Invoker.CreateInstance(targetType);
foreach (var s_pro in sourceProArray)
{
if (!s_pro.CanRead)
{
continue;
}
foreach (var t_pro in targetProArray)
{
if (ignoreTargetProperties.Contains(t_pro.Name))
{
continue;
}
StringComparison com = propertyNameIgnoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal;
if (t_pro.CanWrite && string.Compare(t_pro.Name, s_pro.Name, com) == 0)
{
Type s_p_type = Invoker.GetPropertyType(sourceType, s_pro.Name);
Type t_p_type = Invoker.GetPropertyType(targetType, t_pro.Name);
object value = Invoker.PropertyGet(sourceType, source, s_pro.Name, false, true);
Invoker.PropertySet(target, t_pro.Name, Convert(s_p_type, t_p_type, value, propertyNameIgnoreCase,
columnName + (columnName.Length > 0 ? "." : "") + s_pro.Name, propertyName + (propertyName.Length > 0 ? "." : "") + t_pro.Name,
new List <string>()));
break;
}
}
}
return(target);
}