通过反射查找可空属性的类型

我通过反射检查对象的属性，并继续处理每个属性的数据类型。以下是我的(简化的)资料来源:

private void ExamineObject(object o)
{
Type type = default(Type);
Type propertyType = default(Type);
PropertyInfo[] propertyInfo = null;


type = o.GetType();


propertyInfo = type.GetProperties(BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Instance);
// Loop over all properties
for (int propertyInfoIndex = 0; propertyInfoIndex <= propertyInfo.Length - 1; propertyInfoIndex++)
{
propertyType = propertyInfo[propertyInfoIndex].PropertyType;
}
}

我的问题是，我最近需要处理可空属性，但是我不知道如何获得可空属性的类型。

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最佳答案

possible solution:

    propertyType = propertyInfo[propertyInfoIndex].PropertyType;
if (propertyType.IsGenericType &&
propertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
{
propertyType = propertyType.GetGenericArguments()[0];
}
小开

Nullable.GetUnderlyingType(fi.FieldType) will do the work for you check below code for do the thing you want

System.Reflection.FieldInfo[] fieldsInfos = typeof(NullWeAre).GetFields();


foreach (System.Reflection.FieldInfo fi in fieldsInfos)
{
if (fi.FieldType.IsGenericType
&& fi.FieldType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
{
// We are dealing with a generic type that is nullable
Console.WriteLine("Name: {0}, Type: {1}", fi.Name, Nullable.GetUnderlyingType(fi.FieldType));
}


}
小开 
foreach (var info in typeof(T).GetProperties())
{
var type = info.PropertyType;
var underlyingType = Nullable.GetUnderlyingType(type);
var returnType = underlyingType ?? type;
}
小开

I am using a loop to go through all class properties to get the property type. I use the following code:

public Dictionary<string, string> GetClassFields(TEntity obj)
{
Dictionary<string, string> dctClassFields = new Dictionary<string, string>();


foreach (PropertyInfo property in obj.GetType().GetProperties())
{
if (property.PropertyType.IsGenericType && property.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>) && property.PropertyType.GetGenericArguments().Length > 0)
dctClassFields.Add(property.Name, property.PropertyType.GetGenericArguments()[0].FullName);
else
dctClassFields.Add(property.Name, property.PropertyType.FullName);
}


return dctClassFields;
}
小开

This method is easy, fast and safe

public static class PropertyInfoExtension {
public static bool IsNullableProperty(this PropertyInfo propertyInfo)
=> propertyInfo.PropertyType.Name.IndexOf("Nullable`", StringComparison.Ordinal) > -1;
}
小开

As pointed out by Yves M. it is as simple as below.

var properties = typeof(T).GetProperties();


foreach (var prop in properties)
{
var propType = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
var dataType = propType.Name;
}

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