private async Task <ModelBindingResult> RunModelBinders(ModelBindingContext bindingContext)
{
RuntimeHelpers.EnsureSufficientExecutionStack();
// Perf: Avoid allocations
for (var i = 0; i < ModelBinders.Count; i++)
{
var binder = ModelBinders[i];
var result = await binder.BindModelAsync(bindingContext);
if (result != ModelBindingResult.NoResult)
{
// This condition is necessary because the ModelState entry would never be validated if
// caller fell back to the empty prefix, leading to an possibly-incorrect !IsValid. In most
// (hopefully all) cases, the ModelState entry exists because some binders add errors before
// returning a result with !IsModelSet. Those binders often cannot run twice anyhow.
if (result.IsModelSet ||
bindingContext.ModelState.ContainsKey(bindingContext.ModelName))
{
if (bindingContext.IsTopLevelObject && result.Model != null)
{
ValidationStateEntry entry;
if (!bindingContext.ValidationState.TryGetValue(result.Model, out entry))
{
entry = new ValidationStateEntry();
bindingContext.ValidationState.Add(result.Model, entry);
}
entry.Key = entry.Key ?? result.Key;
entry.Metadata = entry.Metadata ?? bindingContext.ModelMetadata;
}
return(result);
}
// Current binder should have been able to bind value but found nothing. Exit loop in a way that
// tells caller to fall back to the empty prefix, if appropriate. Do not return result because it
// means only "other binders are not applicable".
break;
}
}
// Either we couldn't find a binder, or the binder couldn't bind. Distinction is not important.
return(ModelBindingResult.NoResult);
}
private async Task RunModelBinders(ModelBindingContext bindingContext)
{
RuntimeHelpers.EnsureSufficientExecutionStack();
ModelBindingResult?overallResult = null;
try
{
using (bindingContext.EnterNestedScope())
{
if (PrepareBindingContext(bindingContext))
{
// Perf: Avoid allocations
for (var i = 0; i < ModelBinders.Count; i++)
{
var binder = ModelBinders[i];
await binder.BindModelAsync(bindingContext);
if (bindingContext.Result != null)
{
var result = bindingContext.Result.Value;
// This condition is necessary because the ModelState entry would never be validated if
// caller fell back to the empty prefix, leading to an possibly-incorrect !IsValid. In most
// (hopefully all) cases, the ModelState entry exists because some binders add errors before
// returning a result with !IsModelSet. Those binders often cannot run twice anyhow.
if (result.IsModelSet ||
bindingContext.ModelState.ContainsKey(bindingContext.ModelName))
{
if (bindingContext.IsTopLevelObject && result.Model != null)
{
ValidationStateEntry entry;
if (!bindingContext.ValidationState.TryGetValue(result.Model, out entry))
{
entry = new ValidationStateEntry()
{
Key = result.Key,
Metadata = bindingContext.ModelMetadata,
};
bindingContext.ValidationState.Add(result.Model, entry);
}
}
overallResult = bindingContext.Result;
return;
}
// Current binder should have been able to bind value but found nothing. Exit loop in a way that
// tells caller to fall back to the empty prefix, if appropriate. Do not return result because it
// means only "other binders are not applicable".
// overallResult MUST still be null at this return statement.
return;
}
}
}
}
}
finally
{
bindingContext.Result = overallResult;
}
}
