يجب أن تحتوي DataServiceCollection المطلوب تعقبها على عناصر من النوع وحدة بخاصية مفتاح واحدة على الأقل. ولا يشتمل نوع المفتاح '<var>Type Name</var>' على أي خاصية مفتاح.

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The DataServiceCollection to be tracked must contain entity typed elements with at least one key property. The element type '<var>Type Name</var>' does not have any key property.

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