dxg：GridSummaryItem SummaryType =“ Count”无法识别或访问成员“ SummaryType”

Question

我使用GridsummaryItem将TotalSummary添加到了GridControl，但是无法识别或访问成员“ SummaryType”，无法在Visual Studio中看到设计，但是在运行应用程序时显示摘要。

print("What language would you prefer?\n e for English, s for spanish, f for french")

choice= input("Your choice\n")

english= "Hello iso-3166-2: en-us"
french= "Salut! iso-3166-2:fr"
spanish= "Ola iso-3166-2:es"

if choice == "e":
    print (english)
elif choice == "f":
    print (french)
elif choice == "s":
    print (spanish) 

while True:
    res= input("Do you want to choose another language? Yes/No:")
    if res == "No":
        break