似乎Angular2使用对象引用而不是属性，因此，如果这样做，它将起作用:

It seems Angular2 uses objects reference, instead of properties, so if you do this, it will work:

private onEdit(relationship: Relationship): void {
  this.selectedSupplier = this.suppliers.find(supplier => supplier.id === relationship.supplierId);
}

您需要传递与选择对象完全相同的对象.

You need to pass the exact same object from the select.