Merge two xml files from two memory streams using linq and print the new file-CodePudding

--edit I will worry about memory stream later, how do I combined the strings first and print the output? --edit

string1 xml

<study-groups>
  <study-group>
    <name></name>
    <uuid></uuid>
    <href></href>
  </study-group>
</study-groups>

xml string2

<studies>
 <study>
    <name>someValue</name>
    <uuid>someValue</uuid>
    <href>someValue</href>
    <parent-uuid>someValue</parent-uuid>
    <created-at>2015-08-12T17:51:03Z</created-at>
    <updated-at>2016-06-18T05:53:01Z</updated-at>
  </study>
  <study>
    <name></name>
    <uuid></uuid>
    <href></href>
    <parent-uuid></parent-uuid>
    <created-at>2015-08-12T17:51:03Z</created-at>
    <updated-at>2016-06-18T05:53:01Z</updated-at>
  </study>
</studies>

I am looping through API HTTP requests and saving the output xml to a string and to a memory stream. the first foreach loop produces a single xml file. in my second for each loop, it returns multiple files. I want to join string1 and string2 to create string 3 without duplicates and pass string 3 into the third 4 each loop.

var xml1 = XDocument.Parse(string1);
var xml2 = XDocument.Parse(string2);


//Combine and remove duplicates
var string3 = xml1.Descendants("study-groups")
    .Union(xml2.Descendants("studies"));

Console.WriteLine("---------------------string 3---------------------------");
Console.WriteLine(string3.ToString());
Console.WriteLine("---------------------string 3---------------------------");

//Combine and keep duplicates
var combinedWithDups = xml1.Descendants("study-groups")
    .Concat(xml2.Descendants("studies"));

foreach (var i in combinedUnique)
{
    Console.WriteLine("---------------------combinednodups---------------------------");
    Console.WriteLine("{0}", i);
    Console.WriteLine("---------------------combinednodups---------------------------");
}

but my output keeps coming out as:

System.Linq.Enumerable UnionIterator2`1[System.Xml.Linq.XElement]

CodePudding user response：

If the problem is simply the output, it's because calling ToString() on an IEnumerable (like most types) will simply print the name of the type.

Instead you could do:

// Join each element in the IEnumerable with a line break
Console.WriteLine(string.Join(Environment.NewLine, string3));

This will produce the following with your example input:

<study-groups>
  <study-group>
    <name></name>
    <uuid></uuid>
    <href></href>
  </study-group>
</study-groups>
<studies>
  <study>
    <name>someValue</name>
    <uuid>someValue</uuid>
    <href>someValue</href>
    <parent-uuid>someValue</parent-uuid>
    <created-at>2015-08-12T17:51:03Z</created-at>
    <updated-at>2016-06-18T05:53:01Z</updated-at>
  </study>
  <study>
    <name></name>
    <uuid></uuid>
    <href></href>
    <parent-uuid></parent-uuid>
    <created-at>2015-08-12T17:51:03Z</created-at>
    <updated-at>2016-06-18T05:53:01Z</updated-at>
  </study>
</studies>

However, if that's all you want, there's no need for using an XDocument. You can simply concatenate the two strings:

var string3 = string1   Environment.NewLine   string2;
Console.WriteLine(string3);