< and
the [Carrier Data guide](https://deviceatlas.com/resources/getting-the-data/carrier-data)
for more information.
#### Loading the data file ####
The Carrier API provides multiple methods to load the data file.
##### Downloading and loading the data file #####
The following examples download the data file, save it to the file system,
load it into the Carrier API and schedule a background task to download and load
a fresh data file at a configured time in the future.
Please see the [Data File Configuration documentation](README.DataFileConfig.html)
to obtain the data file download URL and for data file configuration options.
```csharp
using Com.DeviceAtlas.Carrier;
CarrierApi carrierApi = new CarrierApi();
string dataFileUrl = <data file download URL>;
// Load using custom configuration
DataFileConfig dataFileConfig = DataFileConfigBuilder.Create(<data file download URL>).FileDirectory(<persistent download directory>).BuildCarrier();
carrierApi.DownloadAndLoadDataFile(dataFileConfig);
// Load using default configuration
carrierApi.DownloadAndLoadDataFile(dataFileUrl);
```
##### Loading an existing data file #####
The following examples show how to load a data file that is already on the filesystem.
```csharp
using Com.DeviceAtlas.Carrier;
CarrierApi carrierApi = new CarrierApi();
// Load data from file path
carrierApi.LoadDataFromFile(<data file path>);
```
### Usage ###
The API can be queried by passing any of the following to either the
GetProperty() or the GetProperties() methods.
1. An **IPv4** IP address string. _e.g. "62.40.34.220"_
2. A **Dictionary<string, string>** of HTTP Header names to HTTP Header values.
The API will choose the most appropriate IP address to use.
3. An **HttpRequest** object. The API will choose the most appropriate IP
address to use.
4. **(.NET Framework Only)** Without arguments. The API will choose the most appropriate IP
address to use from the "HttpContext.Current.Request" object.
### Choosing An IP Address ###
If the API is passed either an array of HTTP Headers or nothing is passed it
will try and choose the most suitable IP address for the end client. This is
done by iterating over the following HTTP Headers. The first non-private, valid
IP address is returned as the client IP.
- X-Forwarded-For
- Client-Ip
- X-Client-Ip
- rlnClientIpAddr
- Proxy-Client-Ip
- Wl-Proxy-Client-Ip
- X-Forwarded
- Forwarded-For
- Forwarded
The _X-Forwarded-For_ HTTP header can contain the client IP and multiple proxy
IPs, the API parses the header to extract the client IP.
### Example ###
The API has a very simple interface and can be used as follows:
```csharp
string ip = "62.40.34.220";
CarrierApi carrierApi = CarrierApi();
carrierApi.DownloadAndLoadDataFile(<data file download URL>); // multiple calls will reload the data file each time
// get all properties
Properties props = carrierApi.GetProperties(ip);
// .... use the properties ....
if (props.ContainsKey("networkOperator"))
{
Property property = props.Get("networkOperator");
string operatorName = property.AsString();
Console.WriteLine("networkOperator: " + operatorName);
}
// get a single property
Property mccProp = carrierApi.GetProperty(ip, "mcc");
if (mccProp != null)
{
string mcc = mccProp.AsString();
Console.WriteLine("MCC: " + mcc);
}
```
### Included Examples ###
Please see the Examples directory for example code:
1. **BasicUsage:** Located at Examples/Carrier/basic-usage
2. **SingletonWrapper:** Located at Examples/Carrier/web-usage
### Master Carrier List ###
For a listing of all Carrier names and associated data please see:
https://deviceatlas.com/master-carrier-list
The Carrier List is also available in CSV and XML formats. It can be downloaded
from the above page or from the following download page using your Carrier
Identification licence key:
https://deviceatlas.com/getMasterCarrierList
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