SmartWsdlKit

SmartWsdlKit is a lightweight, high-performance, enterprise-grade WSDL and SOAP client toolkit for .NET.

It is designed from the ground up to eliminate the complexity of Visual Studio Connected Services, svcutil, and legacy SOAP integrations by providing a modern, developer-friendly, and async-first API.

Features

• WSDL 1.1 & 2.0 Parsing: Stream-based XML parsing of services, ports, bindings, operations, messages, and schemas.
• Dynamic SOAP Invocation: Execute SOAP requests using a fluent builder API without compile-time proxy generation.
• Dynamic Object Casting: Deserialize SOAP responses on-the-fly into strongly-typed POCOs using generic type parameters or runtime Type objects.
• SOAP Attachments: Built-in support for SOAP with Attachments (SwA) and Message Transmission Optimization Mechanism (MTOM) with automatic parameter mapping.
• Lightweight Resilience Engine: Polly-less, thread-safe Retry and Circuit Breaker policies to manage transient network/service failures.
• SOAP Traffic Inspector: Enable diagnostics to capture request/response logs, HTTP/SOAP headers, execution timing, and SOAP Fault analyses.
• Robust Authentication: Native support for Anonymous, Basic Auth, Bearer Token, API Key, NTLM, and WS-Security UsernameToken (Plaintext & Password Digest).
• Strongly-Typed Code Generation: Generate C# POCOs, modern C# Records, interface contracts, and client wrappers on-the-fly.
• Roslyn Source Generators: Optional compilation-time proxy generation to eliminate reflection overhead entirely.
• OpenAPI & JSON Schema Conversion: Convert WSDL documents into OpenAPI 3.x specifications and XSD schemas to JSON schemas.
• Zero Third-Party Dependencies: Relying strictly on .NET BCL types (System.Xml, System.Xml.Linq, System.Net.Http) for maximum performance and security compliance.

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Installation

Add the core package to your project:

dotnet add package SmartWsdlKit

To enable compile-time generation, add the source generator package:

dotnet add package SmartWsdlKit.SourceGenerators

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Quick Start

Loading & Exploring a WSDL

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

// Explore high-level service metadata quickly
var info = await WsdlExplorer.ExploreAsync("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso?WSDL");
Console.WriteLine($"Service: {info.ServiceName}");
Console.WriteLine($"Operations: {string.Join(", ", info.SupportedOperations)}");

// Load and parse the full WSDL document
var wsdl = await WsdlDocument.LoadAsync("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso?WSDL");
foreach (var op in wsdl.Operations)
{
    Console.WriteLine($"Operation: {op.Name} | Action: {op.SoapAction}");
}

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SOAP Client Features

Dynamic Invocation & Dictionaries

Execute SOAP calls dynamically without generating proxy classes:

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso"),
    Timeout = TimeSpan.FromSeconds(30)
};

using var client = new SoapClient(options);

// Invoke operation dynamically
var response = await client
    .Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync();

// Read fields directly using dictionary
var resultDict = response.ToDictionary();
Console.WriteLine($"Capital City: {resultDict["CapitalCityResult"]}"); // Outputs: Ankara

JSON Support & Dynamic Invocation

SmartWsdlKit provides first-class support for JSON structures. You can call SOAP operations using a JSON string or JsonDocument and fetch the SOAP response body directly as JSON:

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

// Call operation using a raw JSON string payload
var response = await client
    .Operation("CapitalCity")
    .WithJson("{\"sCountryISOCode\":\"TR\"}")
    .ExecuteAsync();

// Read response body directly as a JSON string
string jsonStr = response.AsJson();
Console.WriteLine(jsonStr); // Outputs: {"CapitalCityResult":"Ankara"}

Strongly-Typed Response Casting

Annotate your target classes with standard C# System.Xml.Serialization attributes, and cast the response dynamically:

1. Generic Casting (ExecuteAsync<T>)

using System;
using System.Xml.Serialization;
using System.Threading.Tasks;
using SmartWsdlKit;

[XmlRoot(ElementName = "CapitalCityResponse", Namespace = "http://www.oorsprong.org/websamples.countryinfo")]
public class CapitalCityResponse
{
    [XmlElement(ElementName = "CapitalCityResult")]
    public string CapitalCityResult { get; set; } = string.Empty;
}

// Option A: Execute and cast directly using generic type parameters
var capitalCity = await client
    .Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync<CapitalCityResponse>();

Console.WriteLine($"Capital City: {capitalCity.CapitalCityResult}"); // Outputs: Ankara

// Option B: Get raw response first, then deserialize/cast as needed
var response = await client
    .Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync();

CapitalCityResponse result = response.As<CapitalCityResponse>();
Console.WriteLine($"Capital City: {result.CapitalCityResult}"); // Outputs: Ankara

2. Runtime Type Parameter Casting (ExecuteAsync(Type))

If you don't know the type at compile-time or need dynamic runtime dispatch, pass a System.Type parameter:

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

Type targetType = typeof(CapitalCityResponse);

// Option A: Execute and cast using runtime Type parameter
object objResult = await client
    .Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync(targetType);

if (objResult is CapitalCityResponse capitalCity)
{
    Console.WriteLine($"Capital City: {capitalCity.CapitalCityResult}"); // Outputs: Ankara
}

// Option B: Deserialize raw response using Type parameter
var response = await client
    .Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync();

object result = response.As(targetType);

SOAP Attachments (SwA & MTOM)

SmartWsdlKit automatically detects parameters of type SoapAttachment and serializes them using the selected mode:

using System;
using System.IO;
using System.Threading.Tasks;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://mock-service.local/files"),
    AttachmentMode = SoapAttachmentMode.Mtom // or SoapAttachmentMode.SwA
};

using var client = new SoapClient(options);

// 1. Automatic mapping via parameters
var attachment = new SoapAttachment(
    contentId: "photo-attachment-1", 
    data: new byte[] { 1, 2, 3, 4 }, // byte array representing file
    contentType: "image/jpeg", 
    fileName: "profile.jpg"
);

var response = await client
    .Operation("UploadUserProfile")
    .With("Username", "john_doe")
    .With("PhotoData", attachment) // Automatically serialized (xop:Include for MTOM, href/cid for SwA)
    .ExecuteAsync();

// 2. Or add attachments explicitly to the request builder
var responseExplicit = await client
    .Operation("UploadRawFile")
    .WithAttachment("file-1", new byte[] { 5, 6, 7, 8 }, "application/pdf", "doc.pdf")
    .ExecuteAsync();

Lightweight Resilience (Retry & Circuit Breaker)

Configure thread-safe retries and circuit breaking without adding bulky dependencies like Polly:

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://invalid-nonexistent-soap-server.local/service.asmx"),
    EnableResilience = true, // Turn on custom resilience engine
    RetryCount = 3,          // Retry up to 3 times on transient failures
    RetryDelay = TimeSpan.FromSeconds(1),
    CircuitBreakerFailureThreshold = 5,              // Trip circuit on 5 consecutive failures
    CircuitBreakerResetTimeout = TimeSpan.FromSeconds(30) // Wait 30s before Half-Open state
};

using var client = new SoapClient(options);

try
{
    var response = await client.Operation("PerformTransaction")
        .With("Amount", 150.00m)
        .ExecuteAsync();
}
catch (CircuitBreakerOpenException cbEx)
{
    Console.WriteLine($"Fast-failed! Circuit is open: {cbEx.Message}");
}
catch (SoapException ex)
{
    Console.WriteLine($"Request failed: {ex.Message}");
}

SOAP Traffic Diagnostics Inspector

Track and analyze SOAP requests, responses, HTTP/SOAP headers, timing statistics, and soap faults:

using System;
using System.Threading.Tasks;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso"),
    EnableDiagnostics = true
};

using var client = new SoapClient(options);

// Invoke your calls...
var response = await client.Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .ExecuteAsync();

// Inspect the traffic
var diagnostic = client.GetLastDiagnostic();
if (diagnostic != null)
{
    Console.WriteLine($"[Diagnostic Report - {diagnostic.OperationName}]");
    Console.WriteLine($"Endpoint URL: {diagnostic.EndpointUrl}");
    Console.WriteLine($"Status Code: {diagnostic.HttpStatusCode}");
    Console.WriteLine($"Success: {diagnostic.IsSuccess}");
    Console.WriteLine($"Execution Duration: {diagnostic.ExecutionTimeMs} ms");
    Console.WriteLine($"Request SOAP XML: \n{diagnostic.RequestXml}");
    Console.WriteLine($"Response SOAP XML: \n{diagnostic.ResponseXml}");

    // Inspect HTTP Headers
    foreach (var header in diagnostic.ResponseHeaders)
    {
        Console.WriteLine($"Header: {header.Key} = {header.Value}");
    }
}

Custom HTTP & SOAP XML Headers

You can customize both HTTP protocol headers and SOAP <soap:Header> elements dynamically on a per-request basis:

using System;
using System.Xml.Linq;
using System.Threading.Tasks;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso")
};

using var client = new SoapClient(options);

// 1. Custom HTTP Headers
var responseHttp = await client.Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    .WithHttpHeader("X-Client-Id", "smart-client-99")
    .WithHttpHeader("X-Custom-Auth", "token-xyz-123")
    .ExecuteAsync();

// 2. Custom SOAP XML Headers (placed inside <soap:Header>)
var responseSoap = await client.Operation("CapitalCity")
    .With("sCountryISOCode", "TR")
    // A. With default target namespace mapping: <tns:ApiKey>123456</tns:ApiKey>
    .WithSoapHeader("ApiKey", "123456")
    
    // B. With custom namespace mapping: <ns:SessionId xmlns:ns="http://schemas.example.com">session-abc</ns:SessionId>
    .WithSoapHeader("SessionId", "http://schemas.example.com", "session-abc")
    
    // C. With complex custom XML structure using XElement:
    .WithSoapHeader(new XElement("UserInfo",
        new XElement("UserId", "user-100"),
        new XElement("UserRole", "Supervisor")
    ))
    .ExecuteAsync();

Strongly-Typed Client Code Generation

Generate the C# DTO types and client wrapper from the WSDL first:

using System.IO;
using System.Threading.Tasks;
using SmartWsdlKit;

// 1. Load WSDL
var wsdl = await WsdlDocument.LoadAsync("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso?WSDL");

// 2. Generate the C# DTO types and proxy client wrapper
var csharpCode = WsdlCodeGenerator.Generate(wsdl, new CodeGeneratorOptions
{
    Namespace = "MyService",
    GenerateRecords = true
});
File.WriteAllText("GeneratedClient.cs", csharpCode);

Then consume the generated client in your application:

using System;
using System.Threading.Tasks;
using MyService;
using SmartWsdlKit;

class Program
{
    static async Task Main()
    {
        var options = new SoapClientOptions
        {
            BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso")
        };

        // Consume the generated client wrapper
        using var client = new CountryInfoServiceSoapTypeClient(options);
        
        var request = new CapitalCityRequest { sCountryISOCode = "TR" };
        var response = await client.CapitalCityAsync(request);

        Console.WriteLine($"Capital Name: {response.CapitalCityResult}"); // Outputs: Ankara
    }
}

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Authentication Configurations

SmartWsdlKit provides clean and fluent configurations for securing your SOAP integrations:

using System;
using SmartWsdlKit;

var options = new SoapClientOptions
{
    BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso")
};

using var client = new SoapClient(options);

// 1. Basic Authentication
client.WithBasicAuth("admin_user", "secure_password_123");

// 2. Bearer Token
client.WithBearerToken("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...");

// 3. WS-Security UsernameToken (Plaintext)
client.WithWsSecurity("WsdlUser", "SecretPassword123", WsSecurityPasswordType.Plaintext);

// 4. WS-Security UsernameToken (Password Digest with SHA1, Nonce, and Created timestamp)
client.WithWsSecurity("WsdlUser", "SecretPassword123", WsSecurityPasswordType.PasswordDigest);

// 5. API Key (Header or Query)
client.WithApiKey("X-API-Key", "api-key-value-98765", ApiKeyLocation.Header);

// 6. NTLM / Windows Authentication
client.WithNtlmAuth("win_user", "win_pass", "my_domain");

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OpenAPI & JSON Schema Generation

Convert standard WSDL schemas into OpenAPI 3.0 specs to wrap SOAP endpoints behind API Gateways:

using System.IO;
using System.Threading.Tasks;
using SmartWsdlKit;

var wsdl = await WsdlDocument.LoadAsync("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso?WSDL");

var openApiJson = OpenApiGenerator.Generate(wsdl);
File.WriteAllText("openapi-spec.json", openApiJson);

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Performance Notes & Best Practices

1. Reuse SoapClient & HttpClient Integration: SoapClient supports dependency injection and connection pooling. Instead of creating short-lived clients, you can register SoapClient in your ASP.NET Core service container with standard HttpClient injection:

   builder.Services.AddHttpClient<SoapClient>((httpClient, sp) =>
   {
       var options = new SoapClientOptions
       {
           BaseAddress = new Uri("http://webservices.oorsprong.org/websamples.countryinfo/CountryInfoService.wso"),
           EnableDiagnostics = true,
           MaxDiagnosticsCount = 50 // Rolling buffer limit to prevent memory leaks in production
       };
       return new SoapClient(httpClient, options);
   });

2. Pre-Compiled XmlSerializer Caching: SoapResponse.As<T>() automatically caches the dynamically generated XmlSerializer instances. This prevents severe memory leaks (assemblies not garbage collected) and speeds up XML-to-POCO deserialization by avoiding runtime compilation on every response.
3. Property Reflection Cache: SOAP parameters serialization is optimized using a thread-safe property cache to prevent reflection overhead during hot paths.
4. Culture Invariance: SmartWsdlKit automatically formats parameters (like decimal, double, and DateTime) using CultureInfo.InvariantCulture. Avoid manual string formatting which might clash with localized system cultures (e.g. Turkish İ/i or European comma separators).
5. SOAP Fault Handling: If the service returns a SOAP Fault, SmartWsdlKit parses the Fault information and throws a structured SoapFaultException containing the code, reason, and detail elements.
6. Non-200 Response Fallback: If a SOAP endpoint returns a non-200 status code and the response is not valid XML (e.g. gateway HTML error pages), SmartWsdlKit extracts the raw HTML text as a backup plan and includes it inside the thrown SoapException.

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Troubleshooting

• SocketException (No such host is known): Verify that the BaseAddress in your SoapClientOptions is correct, or check if the target endpoint is reachable.
• WsdlParseException: Ensure the WSDL URL is accessible and points to a valid WSDL 1.1 or 2.0 structure. Relative imports are resolved automatically, but require network/file permissions.

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License

This project is licensed under the MIT License.