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Evaluates a given template and returns the response. The mapping template can be a request or response template.
Request templates take the incoming request after a GraphQL operation is parsed and convert it into a request configuration for the selected data source operation. Response templates interpret responses from the data source and map it to the shape of the GraphQL field output type.
Mapping templates are written in the Apache Velocity Template Language (VTL).
This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginEvaluateMappingTemplate and EndEvaluateMappingTemplate.
Namespace: Amazon.AppSync
Assembly: AWSSDK.AppSync.dll
Version: 3.x.y.z
public virtual Task<EvaluateMappingTemplateResponse> EvaluateMappingTemplateAsync( EvaluateMappingTemplateRequest request, CancellationToken cancellationToken )
Container for the necessary parameters to execute the EvaluateMappingTemplate service method.
A cancellation token that can be used by other objects or threads to receive notice of cancellation.
| Exception | Condition |
|---|---|
| AccessDeniedException | You don't have access to perform this operation on this resource. |
| BadRequestException | The request is not well formed. For example, a value is invalid or a required field is missing. Check the field values, and then try again. |
| InternalFailureException | An internal AppSync error occurred. Try your request again. |
.NET:
Supported in: 8.0 and newer, Core 3.1
.NET Standard:
Supported in: 2.0
.NET Framework:
Supported in: 4.5 and newer