public void WriteTagHelperExecute_DesignTime_WritesNothing()
{
// Arrange
var extension = new DefaultTagHelperTargetExtension()
{
DesignTime = true
};
var context = TestCodeRenderingContext.CreateDesignTime();
var tagHelperNode = new TagHelperIntermediateNode();
var node = new DefaultTagHelperExecuteIntermediateNode();
tagHelperNode.Children.Add(node);
Push(context, tagHelperNode);
// Act
extension.WriteTagHelperExecute(context, node);
// Assert
var csharp = context.CodeWriter.GenerateCode();
Assert.Equal(
@"",
csharp,
ignoreLineEndingDifferences: true);
}
public void WriteTagHelperExecute_Runtime_RendersCorrectly()
{
// Arrange
var extension = new DefaultTagHelperTargetExtension();
var context = TestCodeRenderingContext.CreateRuntime();
var tagHelperNode = new TagHelperIntermediateNode();
var node = new DefaultTagHelperExecuteIntermediateNode();
tagHelperNode.Children.Add(node);
Push(context, tagHelperNode);
// Act
extension.WriteTagHelperExecute(context, node);
// Assert
var csharp = context.CodeWriter.GenerateCode();
Assert.Equal(
@"await __tagHelperRunner.RunAsync(__tagHelperExecutionContext);
if (!__tagHelperExecutionContext.Output.IsContentModified)
{
await __tagHelperExecutionContext.SetOutputContentAsync();
}
Write(__tagHelperExecutionContext.Output);
__tagHelperExecutionContext = __tagHelperScopeManager.End();
",
csharp,
ignoreLineEndingDifferences: true);
}
public void WriteTagHelperExecute(CodeRenderingContext context, DefaultTagHelperExecuteIntermediateNode node)
{
if (context.Parent as TagHelperIntermediateNode == null)
{
var message = Resources.FormatIntermediateNodes_InvalidParentNode(node.GetType(), typeof(TagHelperIntermediateNode));
throw new InvalidOperationException(message);
}
// We always render `await __tagHelperRunner.RunAsync(__tagHelperExecutionContext);` to notify users of the requirement for a method
// to be asynchronous.
context.CodeWriter
.Write("await ")
.WriteStartInstanceMethodInvocation(
RunnerVariableName,
RunnerRunAsyncMethodName)
.Write(ExecutionContextVariableName)
.WriteEndMethodInvocation();
if (!context.Options.DesignTime)
{
var tagHelperOutputAccessor = $"{ExecutionContextVariableName}.{ExecutionContextOutputPropertyName}";
context.CodeWriter
.Write("if (!")
.Write(tagHelperOutputAccessor)
.Write(".")
.Write(TagHelperOutputIsContentModifiedPropertyName)
.WriteLine(")");
using (context.CodeWriter.BuildScope())
{
context.CodeWriter
.Write("await ")
.WriteInstanceMethodInvocation(
ExecutionContextVariableName,
ExecutionContextSetOutputContentAsyncMethodName);
}
context.CodeWriter
.WriteStartMethodInvocation(WriteTagHelperOutputMethod)
.Write(tagHelperOutputAccessor)
.WriteEndMethodInvocation()
.WriteStartAssignment(ExecutionContextVariableName)
.WriteInstanceMethodInvocation(
ScopeManagerVariableName,
ScopeManagerEndMethodName);
}
}
