/// <summary>
/// Renders a template from a string input to a file output.
/// Same text templates are compiled and cached for re-use.
/// </summary>
/// <param name="templateText">Text of the template to run</param>
/// <param name="context">Optional context to pass</param>
/// <param name="outputFile">Output file where output is sent to</param>
/// <returns></returns>
public bool RenderTemplateToFile(string templateText, object context, string outputFile)
{
CompiledAssemblyItem assItem = GetAssemblyFromStringAndCache(templateText);
if (assItem == null)
{
return(false);
}
StreamWriter writer = null;
try
{
writer = new StreamWriter(outputFile, false,
Engine.Configuration.OutputEncoding,
Engine.Configuration.StreamBufferSize);
}
catch (Exception ex)
{
SetError("Unable to write template output to " + outputFile + ": " + ex.Message);
return(false);
}
return(this.RenderTemplateFromAssembly(assItem.AssemblyId, context, writer));
}
/// <summary>
/// Call this method to actually render a template to the specified outputfile
/// </summary>"
/// <param name="templateText">The template text to parse and render</param>
/// <param name="model">
/// Any object that will be available in the template as a dynamic of this.Context or
/// if the type matches the template type this.Model.
/// </param>
/// <param name="writer">Optional textwriter that output is written to</param>
/// <param name="inferModelType">If true infers the model type if no @model or @inherits tag is provided</param>
/// <returns>rendering results or null on failure. If a writer is a passed string.Empty is returned or null for failure</returns>
public string RenderTemplate(string templateText,
object model = null,
TextWriter writer = null,
bool inferModelType = false)
{
if (inferModelType && model != null &&
!templateText.Trim().StartsWith("@model ") &&
!templateText.Trim().StartsWith("@inherits "))
{
templateText = "@model " + model.GetType().FullName + "\r\n" + templateText;
}
CompiledAssemblyItem assItem = GetAssemblyFromStringAndCache(templateText);
if (assItem == null)
{
return(null);
}
// String result will be empty as output will be rendered into the
// Response object's stream output. However a null result denotes
// an error
string result = Engine.RenderTemplateFromAssembly(assItem.AssemblyId, model, writer);
if (result == null)
{
ErrorMessage = Engine.ErrorMessage;
return(null);
}
return(result);
}
/// <summary>
/// Renders a template from a string input to a file output.
/// Same text templates are compiled and cached for re-use.
/// </summary>
/// <param name="templateText">Text of the template to run</param>
/// <param name="model">Optional model to pass</param>
/// <param name="outputFile">Output file where output is sent to</param>
/// <param name="inferModelType">If true infers the model type if no @model or @inherits tag is provided</param>
/// <returns></returns>
public bool RenderTemplateToFile(string templateText, object model, string outputFile, bool inferModelType = false)
{
if (inferModelType && model != null &&
!templateText.Trim().StartsWith("@model ") &&
!templateText.Trim().StartsWith("@inherits "))
{
templateText = "@model " + model.GetType().FullName + "\r\n" + templateText;
}
CompiledAssemblyItem assItem = GetAssemblyFromStringAndCache(templateText);
if (assItem == null)
{
return(false);
}
StreamWriter writer = null;
try
{
writer = new StreamWriter(outputFile, false,
Engine.Configuration.OutputEncoding,
Engine.Configuration.StreamBufferSize);
}
catch (Exception ex)
{
SetError("Unable to write template output to " + outputFile + ": " + ex.Message);
return(false);
}
return(RenderTemplateFromAssembly(assItem.AssemblyId, model, writer));
}
/// <summary>
/// Internally tries to retrieve a previously compiled template from cache
/// if not found compiles a template into an assembly
/// always returns an assembly id as a string.
/// </summary>
/// <param name="templateText">The text to parse</param>
/// <returns>assembly id as a string or null on error</returns>
protected virtual CompiledAssemblyItem GetAssemblyFromStringAndCache(string templateText)
{
int hash = templateText.GetHashCode();
CompiledAssemblyItem item = null;
this.LoadedAssemblies.TryGetValue(hash, out item);
string assemblyId = null;
// Check for cached instance
if (item != null)
{
assemblyId = item.AssemblyId;
}
else
{
item = new CompiledAssemblyItem();
}
// No cached instance - create assembly and cache
if (assemblyId == null)
{
string safeClassName = GetSafeClassName(null);
assemblyId = Engine.CompileTemplate(templateText, GeneratedNamespace, safeClassName);
if (assemblyId == null)
{
this.ErrorMessage = Engine.ErrorMessage;
return(null);
}
item.AssemblyId = assemblyId;
item.CompileTimeUtc = DateTime.UtcNow;
item.SafeClassName = safeClassName;
this.LoadedAssemblies[hash] = item;
}
return(item);
}
/// <summary>
/// Call this method to actually render a template to the specified outputfile
/// </summary>"
/// <param name="templateText">The template text to parse and render</param>
/// <param name="model">
/// Any object that will be available in the template as a dynamic of this.Context or
/// if the type matches the template type this.Model.
/// </param>
/// <returns>rendering results or null on failure. If a writer is a passed string.Empty is returned or null for failure</returns>
public string RenderTemplate(string templateText, object model = null, TextWriter writer = null)
{
CompiledAssemblyItem assItem = GetAssemblyFromStringAndCache(templateText);
if (assItem == null)
{
return(null);
}
// String result will be empty as output will be rendered into the
// Response object's stream output. However a null result denotes
// an error
string result = Engine.RenderTemplateFromAssembly(assItem.AssemblyId, model, writer);
if (result == null)
{
this.ErrorMessage = Engine.ErrorMessage;
return(null);
}
return(result);
}
