/// <summary>
/// 将模板内容编译并输出内存流
/// </summary>
/// <param name="templateSource"></param>
/// <param name="options"></param>
/// <returns></returns>
private static MemoryStream CreateAndCompileToStream(string templateSource, ViewEngineCompilationOptions options)
{
templateSource = WriteDirectives(templateSource, options);
var engine = RazorProjectEngine.Create(
RazorConfiguration.Default,
RazorProjectFileSystem.Create(@"."),
(builder) =>
{
builder.SetNamespace(options.TemplateNamespace);
});
var fileName = Path.GetRandomFileName();
var document = RazorSourceDocument.Create(templateSource, fileName);
var codeDocument = engine.Process(
document,
null,
new List <RazorSourceDocument>(),
new List <TagHelperDescriptor>());
var razorCSharpDocument = codeDocument.GetCSharpDocument();
var syntaxTree = CSharpSyntaxTree.ParseText(razorCSharpDocument.GeneratedCode);
var compilation = CSharpCompilation.Create(
fileName,
new[]
{
syntaxTree
},
options.ReferencedAssemblies
.Select(ass => MetadataReference.CreateFromFile(ass.Location))
.Concat(options.MetadataReferences)
.ToList(),
new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
var memoryStream = new MemoryStream();
var emitResult = compilation.Emit(memoryStream);
if (!emitResult.Success)
{
var errors = emitResult.Diagnostics.ToList();
var exception = new ViewEngineCompilationException($"Unable to compile template: {errors.FirstOrDefault()}")
{
Errors = errors,
GeneratedCode = razorCSharpDocument.GeneratedCode
};
throw exception;
}
memoryStream.Position = 0;
return(memoryStream);
}
/// <summary>
/// 写入Razor 命令
/// </summary>
/// <param name="content"></param>
/// <param name="options"></param>
/// <returns></returns>
private static string WriteDirectives(string content, ViewEngineCompilationOptions options)
{
var stringBuilder = new StringBuilder();
stringBuilder.AppendLine($"@inherits {options.Inherits}");
foreach (var entry in options.DefaultUsings)
{
stringBuilder.AppendLine($"@using {entry}");
}
stringBuilder.Append(content);
return(stringBuilder.ToString());
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="options"></param>
public ViewEngineCompilationOptionsBuilder(ViewEngineCompilationOptions options = null)
{
Options = options ?? new ViewEngineCompilationOptions();
}