how to close mat dialog from ts code example

Example 1: mat dialog disable close

this.dialog.open(DialogComponent, { disableClose: true });

Example 2: close mat dialog programmatically

@Component({/* ... */})
export class YourDialog {
  constructor(public dialogRef: MatDialogRef<YourDialog>) { }

  closeDialog() {
    this.dialogRef.close('Pizza!');
  }
}