What is the correct way to pull a remote branch to a local branch using libgit2sharp? [duplicate] - libgit2

Question

i try to Checkout a Remotebranch via LibGitSharp. In git itself you use this comands:
git fetch origin
git checkout -b test origin/test
in newer Versions it is just:
git fetch
git checkout test
So i tried this Code:
repo.Fetch("origin");
repo.Checkout("origin/" + Name);
The Fetch and Checkout runs without any problems but there is no copy of the Remotebranch.
Does anyone have an idea to Checkout the Remote with other methods?
My alternative would be to create the Branch in the Repository and push it into Remote:
Branch newBranch = repo.Branches.Add(Name, repo.Branches["master"].Commits.First());
repo.Network.Push(newBranch);
but i get this Exception:
The branch 'Test1' ("refs/heads/Test1") that you are trying to push does not track an upstream branch.
maybe i could set the Branch to an upstream Branch, but i don't know how.
Edit: I haven't explained it properly, so I try to describe it better what the Fetch and Checkout does in my program. The Fetch command is performed correctly. Now if i use the checkout command it should be create an local Branch of the Remotebranch, but it doesn't. I've also tried repo.Checkout(name), without "origin/" ,but it cast an Exception: No valid git object identified by '...' exists in the repository.

Answer 1

If I correctly understand your question, you're willing to create a local branch which would be configured to track the fetched remote tracking branch.
In other words, once you fetch a repository, your references contains remote tracking branches (eg. origin/theBranch) and you'd like to create a local branch bearing the same name (eg. theBranch).
The following example should demonstrate how to do this
const string localBranchName = "theBranch";
// The local branch doesn't exist yet
Assert.Null(repo.Branches[localBranchName]);
// Let's get a reference on the remote tracking branch...
const string trackedBranchName = "origin/theBranch";
Branch trackedBranch = repo.Branches[trackedBranchName];
// ...and create a local branch pointing at the same Commit
Branch branch = repo.CreateBranch(localBranchName, trackedBranch.Tip);
// The local branch is not configured to track anything
Assert.False(branch.IsTracking);
// So, let's configure the local branch to track the remote one.
Branch updatedBranch = repo.Branches.Update(branch,
b => b.TrackedBranch = trackedBranch.CanonicalName);
// Bam! It's done.
Assert.True(updatedBranch.IsTracking);
Assert.Equal(trackedBranchName, updatedBranch.TrackedBranch.Name);
Note: More examples can be found in the BranchFixture.cs test suite.