Swashbuckle - Swagger execute button is not working - asp.net-core-3.1

Question

I am trying to integrate swagger in Asp.Net core 3.1 Web API using Swashbuckle.AspNetCore (5.5.1) with OAS3.
I am having one post method where I need multipart form data (two files and one string value) and for that I have applied below OperationFilter, because I don't want to specify any parameters at action level.
public class ComparePostParamTypes : IOperationFilter
{
public void Apply(OpenApiOperation operation, OperationFilterContext context)
{
var listOfOutputFormats = new List<string> { "Rtf", "Doc", "DocX", "Pdf" };
var optionArray = new OpenApiArray();
optionArray.AddRange(listOfOutputFormats.Select(s => new OpenApiString(s)));
string documentOutputFormatText =
"The format to return";
switch (operation.OperationId)
{
case "File_Post":
operation.Parameters.Clear();
operation.Parameters = new List<OpenApiParameter>
{
new OpenApiParameter
{
Name = "file1", In = ParameterLocation.Query,
Required = true,
Description = "First Document",
Schema = new OpenApiSchema()
{
Type="string",
Format="binary"
}
},
new OpenApiParameter
{
Name = "file2", In = ParameterLocation.Query,
Required = true,
Description = "Second Document",
Schema = new OpenApiSchema()
{
Type="string",
Format="binary"
}
},
new OpenApiParameter
{Name = "outputFormat", In = ParameterLocation.Query, Description = documentOutputFormatText,
Schema = new OpenApiSchema()
{
Type="string",
Enum = optionArray,
Default = new OpenApiString("Rtf"),
}
}
};
break;
}
}
}
This is my controller endpoint
/// <summary>
/// POSTing two documents as a multipart/form-data.
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns>The result in the specified format (see outputFormat parameter)</returns>
/// <remarks>
/// Pass two document and output format</remarks>
/// <response code="200">OK</response>
/// <response code="500">Internal error</response>
/// <response code="403">Forbidden</response>
/// <response code="422">UnprocessableEntity</response>
/// <response code="503">ServiceUnavailable</response>
/// <response code="400">BadRequest</response>
[Produces("application/pdf", "application/msword", "application/zip")]
[Consumes("multipart/form-data")]
[ProducesResponseType(StatusCodes.Status200OK, Type = null)]
[ProducesResponseType(StatusCodes.Status500InternalServerError, Type = null)]
[ProducesResponseType(StatusCodes.Status403Forbidden, Type = null)]
[ProducesResponseType(StatusCodes.Status422UnprocessableEntity, Type = null)]
[ProducesResponseType(StatusCodes.Status503ServiceUnavailable, Type = null)]
[ProducesResponseType(StatusCodes.Status400BadRequest, Type = null)]
[HttpPost(Name ="File_Post")]
public IActionResult Post()
{
var builBoundary = Request.GetMultipartBoundary();
return Ok(builBoundary);
}
Correct Swagger UI is rendered
Swagger UI
But when I clicked on execute button after attaching files nothing happened.
This is generated swagger JSON
{
"openapi": "3.0.1",
"info": {
"title": "Demo",
"version": "v1"
},
"paths": {
"/File": {
"post": {
"tags": [
"File"
],
"summary": "POSTing two documents as a multipart/form-data.",
"description": "Pass two document and output format",
"operationId": "File_Post",
"parameters": [
{
"name": "file1",
"in": "query",
"description": "First Document",
"required": true,
"schema": {
"type": "string",
"format": "binary"
}
},
{
"name": "file2",
"in": "query",
"description": "Second Document",
"required": true,
"schema": {
"type": "string",
"format": "binary"
}
},
{
"name": "outputFormat",
"in": "query",
"description": "The format to return",
"schema": {
"enum": [
"Rtf",
"Doc",
"DocX",
"Pdf"
],
"type": "string",
"default": "Rtf"
}
}
],
"responses": {
"200": {
"description": "OK"
},
"500": {
"description": "Internal error"
},
"403": {
"description": "Forbidden"
},
"422": {
"description": "UnprocessableEntity"
},
"503": {
"description": "ServiceUnavailable"
},
"400": {
"description": "BadRequest"
}
}
}
}
},
"components": { }
}
Please tell me what should I do to fix this.

Answer 1

I am able to fix this by updating OperationFilter
public class ComparePostParamTypes : IOperationFilter
{
public void Apply(OpenApiOperation operation, OperationFilterContext context)
{
var listOfOutputFormats = new List<string> { "Rtf", "Doc", "DocX", "Pdf" };
var optionArray = new OpenApiArray();
optionArray.AddRange(listOfOutputFormats.Select(s => new OpenApiString(s)));
string documentOutputFormatText =
"The format to return";
switch (operation.OperationId)
{
case "File_Post":
var multipartBodyPost = new OpenApiMediaType
{
Schema = new OpenApiSchema
{
Type = "object",
Properties =
{
["file1"] = new OpenApiSchema
{
Description = "First Document",
Type = "string",
Format = "binary"
},
["file2"] = new OpenApiSchema
{
Description = "Second Document",
Type = "string",
Format = "binary"
},
["outputFormat"] = new OpenApiSchema
{
Description = documentOutputFormatText,
Type = "string",
Enum = optionArray,
Default = new OpenApiString("Rtf"),
},
},
Required = { "file1", "file2" }
}
};
operation.RequestBody = new OpenApiRequestBody
{
Content =
{
["multipart/form-data"] = multipartBodyPost
}
};
break;
}
}
}
I more details, check this link https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/1782