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Primary Parameter

Description

Using a Field, RefField, Property or DoNotUse attribute on parameters.

Automatically generate private readonly fields or private readonly ref readonly fields or public properties.

Forbid the use of primary constructor's parameters.

Usage

partial class C([Field(Name = "_a", AssignFormat = "{0}.ToString()", Type = typeof(string)), Field(Name = nameof(C._b)), Field, Property(Setter = "init", Summary = "Documentation")]int i) // type must be partial, but can be class / struct
{
# region Generated members
    // private readonly string _a = i.ToString();   // generated field (with type and formated assignment)
    // private readonly int _b = i;                 // generated field (with computed name)
    // private readonly int _i = i;                 // generated field
    /// <summary>
    /// Documentation
    /// </summary>
    // private int I { get; init; } = i;            // generated Property
# endregion

    public void M0()
    {
        i++;                    // error on usage of i
        Console.WriteLine(i);   // error on usage of i
    }

    public void M1()
    {
        var i = 0;
        i++;                    // don't error on usage of locals
        Console.WriteLine(_i);  // automaticaly created readonly field
        Console.WriteLine(_a);  // automaticaly created readonly field based on Name property
        Console.WriteLine(I);   // automaticaly created readonly property
    }
}

ref partial struct Ref([RefField(IsReadonlyRef = false, IsRefReadonly = false), RefField(Name = nameof(Ref.I), Scope = "public")]int i)
{
# region Generated members
    private ref int _i = ref i;
    public readonly ref readonly int I = ref i;
# endregion
}

To enable the feature, type [Field], [RefField], [Property], or [DoNotUse] before the primary parameter you want.

You can type as many attributes as you want on a single parameter (Except for DoNotUse).

Attribute Properties

Reported Diagnostics

.csproj properties

Versions