Get Value from list of objects

Sasi Rekha

List Keyvalues = new List();

AttributeNamesValues keyvalue = new AttributeNamesValues();

keyvalue.AName = "Gross Volume";

keyvalue.AValue = "as100";

Keyvalues.Add(keyvalue);

keyvalue.AName = "Clean Volume";

keyvalue.AValue = "as120";

Keyvalues.Add(keyvalue);

keyvalue.AName = "Clean Volume%";

keyvalue.AValue = "asclean";

Keyvalues.Add(keyvalue);

List attributeNames = (from main in db.Attributes_Sub

where attribute_subid.Contains(main.Id)

select new AttributeKeyValues

{

MainName = main.Attributes_Relation.Select(x => x.Attributes_Main.AttributeName).FirstOrDefault().ToString(),

SubName = main.AttributeSubName,

Value= Keyvalues.Where(item => item.AName == main.AttributeSubName).Select(x1=>x1.AValue).FirstOrDefault().ToString()

}).ToList();

I am getting error at while getting Value please help me

2 Replies

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Ruchi Sharavat8y ago
What I found in your code is:

1. You are assigning value to the same object 3 times without creating that as new. You must re-initialize the object with new keyword each time you assign new values to object "KeyValue" otherwise it would have only last value. In below code snippet I have used "keyvalue = new AttributeNamesValues();" before assigning new value to the same object.
List Keyvalues = new List();
AttributeNamesValues keyvalue = new AttributeNamesValues();
keyvalue.AName = "Gross Volume";
keyvalue.AValue = "as100";
Keyvalues.Add(keyvalue);
keyvalue = new AttributeNamesValues();
keyvalue.AName = "Clean Volume";
keyvalue.AValue = "as120";
Keyvalues.Add(keyvalue);
keyvalue = new AttributeNamesValues();
keyvalue.AName = "Clean Volume%";
keyvalue.AValue = "asclean";
Keyvalues.Add(keyvalue);
2. Your code will work fine with only above code modifications if all values of "main.AttributeSubName" existis on your "keyvalues" list otherwise it would give error. To avoid that you must add check of null like below:
Value= Keyvalues.Where(item => item.AName == main.AttributeSubname).FirstOrDefault()!=null?Keyvalues.Where(item => item.AName == main.AttributeSubname).FirstOrDefault().AValue.ToString():""
Sunny Bhor8y ago
Keyvalues.FirstOrDefault(item => item.AName == main.AttributeSubName).AValue.ToString()