Single
Returns the result only when predicate matches the collection that contains only one matching record.
public List < string > Names = new List < string >() { "Jon" , "Amber" };
public string GetName ()
{
return Names . Single ( n => n . Equals ( "Jon" ));
}
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Throws error if the collection contains more than one matching data or no matching data.
public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . Single ( n => n . Contains ( "Jon" ));
}
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public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . Single ( n => n . Contains ( "ABC" ));
}
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Loops through all the data of the collection even if it found the match in collection which has impact on performance
SingleOrDefault
This is similar to the Single except returning default value when the specified condition not satisfied.
public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . SingleOrDefault ( n => n . Contains ( "ABC" ));
}
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Returns the null
First
Returns the result only when predicate matches the collection even that contains more than one matching record.
public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . First ( n => n . Contains ( "Jon" ));
}
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Throws error if the collection contains no matching data.
public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . First ( n => n . Contains ( "ABC" ));
}
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Will not loops through all the data of the collection once it found the match in collection thus making this is better than Single in terms of performance
FirstOrDefault
This is similar to the First except returning default value when the specified condition not satisfied.
public List < string > Names = new List < string >() { "Jon" , "Amber" , "Depp Jon" , "Heard Amber" };
public string GetName ()
{
return Names . FirstOrDefault ( n => n . Contains ( "ABC" ));
}
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Returns the null
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