Clean NULL condition

Question

Hi,

I have below code for sending push notifications using REST API

var client = new HttpClient();
client.BaseAddress = new Uri("https://onesignal.com/api/v1/notifications");
client.DefaultRequestHeaders.Add("Authorization", "Basic " + SecureStorage.GetAsync("AppAuthID").Result);

var content = new StringContent(JsonSerializer.Serialize(new
{
    app_id = SecureStorage.GetAsync("AppID").Result,
    headings = new
    {
        en = TextBoxNewMessageTitle.Text.Trim()
    },
    subtitle = new
    {
        en = TextBoxNewMessageSubtitle.Text.Trim()
    },
    contents = new
    {
        en = EditorMessage.Text.Trim()
    },
    url = "https://www.cnn.com",
    included_segments = "All",
}), Encoding.UTF8, "application/json");

I want to do a clean NULL condition to check the values before adding it. For example if TextBoxNewMessageTitle.Text isNullOrWhiteSpace then no need to add the headings at all because it should only be added when the TextBoxNewMessageTitle. has a value

Kindly help..

Thanks,
Jassim

Answer 1

Try something like this:

var data = new
 {
     app_id = SecureStorage.GetAsync("AppID").Result,
     headings = string.IsNullOrWhiteSpace(TextBoxNewMessageTitle.Text) ? null : new
     {
         en = TextBoxNewMessageTitle.Text.Trim()
     },
     subtitle = string.IsNullOrWhiteSpace(TextBoxNewMessageSubtitle.Text) ? null :  new
     {
         en = TextBoxNewMessageSubtitle.Text.Trim()
     },
     contents = string.IsNullOrWhiteSpace(EditorMessage.Text) ? null : new
     {
         en = EditorMessage.Text.Trim()
     },
     url = "https://www.cnn.com",
     included_segments = "All",
};

var o = new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull };
string json = JsonSerializer.Serialize( data, o);

var content = new StringContent( json, Encoding.UTF8, "application/json");

Answer 2

Hello,​

Welcome to our Microsoft Q&A platform!

For example if TextBoxNewMessageTitle.Text isNullOrWhiteSpace then no need to add the headings at all

You could use string.IsNullOrWhiteSpace method to check if the text is null, empty, or consists only of white-space characters.

   if (!string.IsNullOrWhiteSpace(TextBoxNewMessageTitle.Text))  
   {  
       ...  
       headings = new  
       {  
           en = TextBoxNewMessageTitle.Text.Trim()  
       }  
   }  

Best Regards,

Jarvan Zhang

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