c# - How can i update DB with associations with EF -

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मेरे पास यह डीबी मॉडल है:

और मैं GROUP तालिका को अपडेट करने की कोशिश कर रहा हूं।

यह मेरा कोड है: 

  का उपयोग करते हुए (var ctx = नया TestModelContainer ()) {ctx.GROUP.Add (नया समूह}, {name = "Group 1", TEACHER = new teacher} {FIO = "123 ", ईमेल =" 123@example.com "}}); ctx.SaveChanges (); }

और लाइन के बाद ctx.SaveChanges () मुझे एक अपवाद मिलता है मैं क्या गलत कर रहा हूं? कृपया मेरी मदद करें।

त्रुटि:

'System.Data.Entity.Infrastructure.DbUpdateException' प्रकार के एक अप्रतिबंधित अपवाद EntityFramework.dll में हुआ

अतिरिक्त जानकारी: प्रविष्टियां अपडेट करते समय एक त्रुटि हुई विवरण के लिए आंतरिक अपवाद देखें।

इनर अपवाद:

कॉलम 'एफआईओ' में मूल्य नल सम्मिलित नहीं किया जा सकता, तालिका 'u399991.dbo.TEACHER'; स्तंभ नल की अनुमति नहीं देता INSERT विफल रहता है

आपने जो प्रदान किया है, आप निम्न प्रयास कर सकते हैं:

स्तंभ के लिए एक गैर-रिक्त मान डालें, या आप यह सुनिश्चित कर सकते हैं कि आपका कॉलम एक शून्य मान स्वीकार करता है।


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