如何重构这个 if-else 条件，使其更简洁、更高效？

Question

I have this piece of code as an Azure function app and I would like to know how can I best handle this if else part.

There are like 100 Project with different customer name.

What is the best way to do it?

If one can show me with an example.

string customerName = string.Empty;
foreach( var doc in result )
{
    var data =(JObject)JsonConvert.DeserializeObject( doc.ToString() );
    if( (string)data["Project"] == "HPD_Oid" )
    {
        customerName = "OPPO";
    }
    else if( (string)data["Project"] == "HPD_Oreal" )
    {
        customerName = "RealMe";
    }
    else
    {
        customerName = "OnePlus";
    }
    string partitionkeyValue = string.Concat( (string)data["class"], "|", (string)data["Project"], "|", customerName );
    data.Add( new JProperty( "PartitionKey", partitionkeyValue ) );

Read customer values:

CustomerSection customer = GetConfiguration( context.FunctionAppDirectory, "CustomerSection.json" );

Get config Value:

private static CustomerSection GetConfiguration( string basePath, string fileName )
        {
            var config = new ConfigurationBuilder()
                   .SetBasePath( basePath )
                   .AddJsonFile( fileName, optional: false )
                   .Build();
            var customerNameOutput = new CustomerSection();
            config.GetSection( "ProjectCustomerMapping" ).Bind( customerNameOutput );
            return customerNameOutput;
        }

public class CustomerSection
    {
        public Dictionary<string, string> CustomerName { get; set; }
    }

Answer 1

Simple, use a dictionary:

Dictionary<string, string> projectCustomerNameMapping = new Dictionary<string, string>()
{
    { "HPD_Oid", "OPPO" },
    { "HPD_Oreal", "RealMe" }
};

And then use a lookup:

if (!projectCustomerNameMapping.TryGetValue((string)data["Project"], out customerName))
{
    // if the value wasn't found in the dictionary, use the default
    customerName = "OnePlus";
}

TryGetValue docs

Answer 2

I have a bunch of extension methods for IDictionary<K, V> like this:

public static class IDictionaryExt
{
    public static Func<K, V> Map<K, V>(this IDictionary<K, V> source, Func<V> @default)
    {
        return key => (key == null || !source.ContainsKey(key)) ? @default() : source[key];
    }
}

I can use this like so:

Func<string, string> projectCustomerNameMapping = new Dictionary<string, string>()
{
    { "HPD_Oid", "OPPO" },
    { "HPD_Oreal", "RealMe" }
}.Map(() => "OnePlus");

Then your code becomes:

string customerName = projectCustomerNameMapping((string)data["Project"]);