How to get the bitcoin balance of a public key in C#?

Question

How can I get the bitcoin balance of a public key in C#?

E.g. for this public key: 1FqLoEpbQpMxow5bqEPpFbPVnBEbFcsg3J

How can I get its balance in C#?

Answer 1

If you are ok with a third party service check out the Blockchain API.

They have a C# library and it's fairly easy to use.

If you need only the balance of an address you can use the code below as described on their BlockExplorer page:

 // calculate the balanace of an address by fetching a list of all its unspent outputs
 var outs = blockExplorer.GetUnspentOutputs("1EjmmDULiZT2GCbJSeXRbjbJVvAPYkSDBw");
 long totalUnspentValue = outs.Sum(x => x.Value);

Answer 2

Take a look at Blockparser: https://github.com/znort987/blockparser**

It will let you parse blockchain data to verify balances (among other things)

Answer 3

using Info.Blockchain.API.BlockExplorer;
using Info.Blockchain.API.Models;

internal decimal CheckBalance(string[] base58Addresses)  {
    BlockExplorer be = new BlockExplorer();
    IEnumerable<UnspentOutput> outs = be.GetUnspentOutputsAsync(base58Addresses).Result;
    decimal totalUnspentValue = outs.Sum(x => x.Value.GetBtc());

    return totalUnspentValue;
 }