由于只想更改控件 id 的值，因此应使用 patchValue 代替 setValue 方法可修改该formControl的值.

Since you want to change only the value of the control id, you should use patchValue instead of setValue method to modify the value of that formControl.

this.subcategoryForm.patchValue({
       id:res.result.Name
});

如果要使用 setValue 方法，则可以从formControl id 调用它:

if you want to use setValue method, you can call it from the formControl id :

this.subcategoryForm.controls['id'].setValue(res.result.Name);