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Apps User Guide
Last updated Feb 19, 2024

Variables in Apps

Use variables to store values between pages.

Note:

You can set a default value of the variable on page load by using the Set Value rule in the Loaded event of the page.

Apps supports creating variables of the following types:

  • AppsFile - file objects specific for Apps, which handles files uploading or downloading.

  • Array - arrays of primitive data types or complex objects. For example:

    • Array of strings : New String() {"Hello", "World"}
    • Array of AppsFile: New AppsFile() { new AppsFile("Url1"), new AppsFile("Url2")}
    • Array of entity type:

      new Customer() { 
      New Customer("1", "Baishali"), 
      New Customer("2", "Viswa"), 
      New Customer("3", "Evan") }new Customer() { 
      New Customer("1", "Baishali"), 
      New Customer("2", "Viswa"), 
      New Customer("3", "Evan") }
  • ChoiceSet - stores the choice set data of an entity. For example:

    • GetChoiceSet("Team") - returns a ListSource with the choice set values.
    • GetChoiceSetValue("Team", 1) - returns the indicated choice set value.
  • DataTable - a system data type used to store the value of a process Datatable output argument, or to create a custom Datatable, for example:

    BuildDataTable(
        New DataTable("TestDT"), 
        New DataColumn(){ New DataColumn("Name"), New DataColumn("Age")},
        New List(Of Object) From { 
            AddDataRow(New Object(){"Baishali", "30"}), 
            AddDataRow(New Object(){"Viswa", "33"}) 
        },
        True
    )BuildDataTable(
        New DataTable("TestDT"), 
        New DataColumn(){ New DataColumn("Name"), New DataColumn("Age")},
        New List(Of Object) From { 
            AddDataRow(New Object(){"Baishali", "30"}), 
            AddDataRow(New Object(){"Viswa", "33"}) 
        },
        True
    )
  • Date - for example, New System.DateTime (1993, 5, 31, 12, 35, 0).
  • DateOnly - a specific date, without time. For example, New System.DateOnly (2020, 04, 20).
  • DateTimeOffset - a date and time, relative to UTC. This structure includes a DateTime value and an Offset property, that defines the difference between the current DateTimeOffset date and the Coordinated Universal Time (UTC). For example:

    new System.DateTimeOffset( new System.DateTime(2023, 5, 15, 7, 0, 0),
      new System.TimeSpan(-7, 0, 0) )
    // output 5/15/2023 7:00:00 AM - 07:00new System.DateTimeOffset( new System.DateTime(2023, 5, 15, 7, 0, 0),
      new System.TimeSpan(-7, 0, 0) )
    // output 5/15/2023 7:00:00 AM - 07:00
  • Decimal number - for example, 88.53.
  • Double

  • Guid - the unique identifier of an entity.

  • Int16

  • Int64

  • List<T> - for example:

    • List of strings : New List(Of String) From {"string 1", "string 2", "string 3"}
    • List of ListPair (for dropdown controls):

      New List(Of Customer) From { 
      New Customer("1", "Baishali"), 
      New Customer("2", "Viswa"), 
      New Customer("3", "Evan") }New List(Of Customer) From { 
      New Customer("1", "Baishali"), 
      New Customer("2", "Viswa"), 
      New Customer("3", "Evan") }
  • ListSource - used to store the result of a entity query in a variable. You need to use the syntax ListSource(of <Entity_name>).
  • Nullable - used to define a null value. By default, all reference types, such as String, are nullable, but all value types, such as Int32, are not.

    Note:

    By default, primitive data types, except String, are non-nullable. Use this variable type to set them to null. For example, if you create an app variable of type Nullable<Int32>, then you can set the value to "Nothing".

  • Object - stores any type.

  • Single - Used to store floating-point values that do not require the full data width of Double. The default value is 0.

  • Text (String) - for example, "Hello world"
  • True or false (Boolean)

  • UInt16 - holds unsigned 16-bit (2-byte) integers ranging in value from 0 through 65,535.

  • UInt32 - holds unsigned 32-bit (4-byte) integers ranging in value from 0 through 4,294,967,295.

  • UInt64 - holds unsigned 64-bit (8-byte) integers ranging in value from 0 through 18,446,744,073,709,551,615.

  • Whole number (Int32) - for example, 88
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