private void btn_OK_Click(object sender, EventArgs e) { if (txt_Store.Text == string.Empty) { MessageBox.Show("空"); return; } if (_favoriteList.GetStoreList().Any(x => x == txt_Store.Text)) { MessageBox.Show("同名存在"); return; } var item = new FavoriteItem(txt_Store.Text, cmb_Prefecture.SelectedText); _favoriteList.AddWrite(item); DialogResult = DialogResult.OK; Close(); }