Check if any property of class is null

Question

I have following class:-

public class Requirements
    {
        public string EventMessageUId { get; set; }
        public string ProjectId { get; set; }            


        

Answer 1

You're checking if the properties themselves are null (which will never be true), not the values of the properties. Use this instead:

bool isNull = objRequirement.GetType().GetProperties()
                            .All(p => p.GetValue(objRequirement) != null);

Answer 2

I use the below extension of the object which I use for validating objects that I don't want to have all properties null or empty in order to save some calls to the database. I think it fits your case along with some more.

    /// <summary>
    /// Returns true is all the properties of the object are null, empty or "smaller or equal to" zero (for int and double)
    /// </summary>
    /// <param name="obj">Any type of object</param>
    /// <returns></returns>
    public static bool IsObjectEmpty(this object obj)
    {
        if (Object.ReferenceEquals(obj, null))
            return true;

        return obj.GetType().GetProperties()
            .All(x => IsNullOrEmpty(x.GetValue(obj)));
    }

    /// <summary>
    /// Checks if the property value is null, empty or "smaller or equal to" zero (for numeric types)
    /// </summary>
    /// <param name="value">The property value</param>
    /// <returns></returns>
    private static bool IsNullOrEmpty(object value)
    {
        if (Object.ReferenceEquals(value, null))
            return true;

        if (value.GetType().GetTypeInfo().IsClass)
            return value.IsObjectEmpty();

        if (value is string || value is char || value is short)
            return string.IsNullOrEmpty((string) value);

        if (value is int)
            return ((int) value) <= 0;

        if (value is double)
            return ((double) value) <= 0;

        if (value is decimal)
            return ((decimal) value) <= 0;

        if (value is DateTime)
            return false;

        // ........
        // Add all other cases that we may need
        // ........

        if (value is object)
            return value.IsObjectEmpty();

        var type = value.GetType();
        return type.IsValueType
            && Object.Equals(value, Activator.CreateInstance(type));
    }

The call is obviously obj.IsObjectEmpty()

Answer 3

This might do the trick for you

objRequirement.GetType().GetProperties()
.Where(pi => pi.GetValue(objRequirement) is string)
.Select(pi => (string) pi.GetValue(objRequirement))
.Any(value => String.IsNullOrEmpty(value));