Allow using previous properties in declaring future properties on an object initializer

[ekolis]

For instance:

var foo = new Foo
{
  Bar = "hello",
  Baz = Bar.IndexOf("h"), // compile error in current C# version
}

[ekolis]

A more real life example:

var person = new Person
{
  Email = "[email protected]",
  EmailTypeID = 1,
  EmailTypeName = LookupEmailTypeName(EmailTypeID),
}

[ronnygunawan]

this will break existing code if containing class has EmailTypeID property or local

[yaakov-h]

I'm 99% sure this has already been raised in another issue, but cannot for the life of me find that other issue.

[bricelam]

I had a similar idea today for a slightly more complex scenario:

new Table
{
    Columns =
    {
        new Column { Name = "Id" } idColumn // 😈
    },
    PrimaryKey = new PrimaryKey
    {
        Columns = { idColumn }
    }
};

[jnm2]

@bricelam
Duplicate except for syntax: #400
Similar but more universal: #595