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我得到一个异常,当我试图将值转换为给定类型,但值保留为空值。如何在值为空时使用Convert.ChangeType(value,type)
//find out the type
Type type = inputObject.GetType();
//get the property information based on the type
System.Reflection.PropertyInfo propertyInfo = type.GetProperty(propertyName);
//find the property type
Type propertyType = propertyInfo.PropertyType;
//Convert.ChangeType does not handle conversion to nullable types
//if the property type is nullable, we need to get the underlying type of the property
var targetType = IsNullableType(propertyInfo.PropertyType) ? Nullable.GetUnderlyingType(propertyInfo.PropertyType) : propertyInfo.PropertyType;
//Returns an System.Object with the specified System.Type and whose value is
//equivalent to the specified object.
propertyVal = Convert.ChangeType(propertyVal, targetType);
在这里,propertyVal =保留空值,所以它引发一个异常。
InvalidCastException:空对象不能转换为值类型。
如果有什么方法可以解决这个问题。
的可能的复制[Convert.ChangeType()上可空类型失败(http://stackoverflow.com/questions/3531318/convert-changetype-fails -on可空类型) –