JSON empty string to null

Question

An empty string is usually parsed to null in JSON but I have a request which contains:

"StreetValue":"",

In my class it is de-serialized as a decimal

public decimal StreetValue { get; set; }

But when I pass the empty string it is getting de-serialized as 0.00M instead of null. What am I missing?

My intent is for it to be de-serialized as 0 only if "0.00M" is passed else it should be null.

decimal is not nullable, you cannot assign null to decimal. — Arghya C
– Arghya C, Commented Nov 10, 2015 at 4:23

Steve · Accepted Answer · 2015-11-10 04:22:29Z

3

Try marking your property as a nullable type (note the question mark):

public decimal? StreetValue { get; set; }

answered Nov 10, 2015 at 4:22

Steve

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victor · Accepted Answer · 2015-11-10 04:24:30Z

1

That is because string is a reference type, whereas decimal is a value type, so it can't be assigned null; instead, your property will receive default(decimal).

As Steve said, you can make your property nullable:

decimal? Prop { get; set; }

This will allow you to use null as you wish.

answered Nov 10, 2015 at 4:24

victor

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Krunal Mevada · Accepted Answer · 2015-11-10 05:01:10Z

-1

Try to make your property to dynamic so you no need to declare data type and not to worry about null value.

public dynamic StreetValue { get; set; }

Edit:

In c# 6.0 property initialization will be available:

public decimal StreetValue { get; set; } = 0.0;

edited Nov 10, 2015 at 5:01

answered Nov 10, 2015 at 4:25

Krunal Mevada

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3 Comments

Steve Over a year ago

This means you lose the type of the property so is not very useful.

Krunal Mevada Over a year ago

@Steve Have you use before that ?

Krunal Mevada Over a year ago

@GilliVilla if you not get value in this property as my answer you get null or empty string when you de-serialized

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