c# - Use Linq and lambda to flatten a list -

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मेरे पास एक वर्ग है। 

  पब्लिक क्लास मेडिकल रिक्वेस्ट {निजी इंट आईडी निजी आईआईएलआईटी & lt; मेडिकलडिज़ एंड जीटी ; दिन निजी स्ट्रिंग MedicalUser ...}

और अन्य 

  सार्वजनिक कक्षा MedicalDays {निजी आईआईटी; निजी समयसीमा? दिन निजी मेडिकल अनुरोध अनुरोध ...}

मेरे पास मेडिकल यूज़र है इसलिए मैं 

  IList & lt; MedicalRequest & gt; ReqList = dao.FindAll (उदाहरण);

इस बिंदु पर मैं क्या करने में सक्षम होना चाहता हूँ, मेडिकल दिवस की सूचियों को समतल कर देता है और दिनांक का समय वापस आ जाता है।

कुछ ऐसा 

  आईआईएलआईटी & lt; दिनांकटाइम & gt; DateList = reqList.SelectMany (i = & gt; i.MedicalDays.day);

क्या कोई मुझे सही दिशा में एक धक्का दे सकता है?

आपके समय के लिए धन्यवाद

आप लगभग वहां हैं: 

  IEnumerable & lt; DateTime? & Gt ; DateList = reqList.SelectMany (i = & gt; i.MedicalDays)। चुनें (एम = & gt; m.day);

या:

<पूर्व> IEnumerable & lt; दिनांकटाइम? & Gt; DateList = reqList.SelectMany (i = & gt; i.MedicalDays, (i, एम) = & gt; m.day);
  • यदि आपको IList & lt; T & gt; की बजाय IEnumerable & lt; T & gt; की आवश्यकता है तो आप ToList ) परिणाम

  • यदि आपको DateTime के बजाय DateTime? के साथ काम करने की आवश्यकता है यह:

    <पूर्व> IEnumerable & lt; दिनांकटाइम? & Gt; DateList = reqList.SelectMany (i = & gt; i.MedicalDays)। चयन करें (m = & gt; m.day)। जहां (एक्स = & gt; x.HasValue)। चयन (x = & gt; x.Value);

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