I was writing the following code and any variable that I created dragged an error:
struct ParagraphInfo
{
public ParagraphInfo(string text)
{
}
int i;
}
The error is:
Field 'ConsoleApplication15.Program.ParagraphInfo.i'
must be fully assigned before control is returned to the caller
The constructor was underlined as the source of the error and once I deleted it the error disappeared.
What is going on?
When the compiler generates a constructor for your struct, everything within the struct is initialized:
struct ParagraphInfo {
int i;
}
ParagraphInfo pi = new ParagraphInfo();
// pi.i == 0 here.
This is a guarantee that you need to ensure as well if you create your own constructor. This will compile:
struct ParagraphInfo {
int i;
public ParagraphInfo(string text) {
i = 0; // you've guaranteed i is initialized.
}
}
Or..
struct ParagraphInfo {
int i;
public ParagraphInfo(string text) : this() {
}
}
You can use this() because the default constructor does the initializing for you.
In the constructor of the Struct types all field values must be assigned. So initialize i in your constructor or change the ParagraphInfo to class.
public ParagraphInfo(string text)
{
this.i = 0;
}
int i;
: this()after your constructor signature definition?