本文整理汇总了C#中Binder.CreateBinderForParameterDefaultValue方法的典型用法代码示例。如果您正苦于以下问题：C# Binder.CreateBinderForParameterDefaultValue方法的具体用法？C# Binder.CreateBinderForParameterDefaultValue怎么用？C# Binder.CreateBinderForParameterDefaultValue使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Binder的用法示例。
在下文中一共展示了Binder.CreateBinderForParameterDefaultValue方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: MakeDefaultExpression
// If binder is null, then get it from the compilation. Otherwise use the provided binder.
// Don't always get it from the compilation because we might be in a speculative context (local function parameter),
// in which case the declaring compilation is the wrong one.
protected ConstantValue MakeDefaultExpression(DiagnosticBag diagnostics, Binder binder)
{
var parameterSyntax = this.CSharpSyntaxNode;
if (parameterSyntax == null)
{
return ConstantValue.NotAvailable;
}
var defaultSyntax = parameterSyntax.Default;
if (defaultSyntax == null)
{
return ConstantValue.NotAvailable;
}
if (binder == null)
{
var syntaxTree = _syntaxRef.SyntaxTree;
var compilation = this.DeclaringCompilation;
var binderFactory = compilation.GetBinderFactory(syntaxTree);
binder = binderFactory.GetBinder(defaultSyntax);
}
BoundExpression valueBeforeConversion;
var convertedExpression = binder.CreateBinderForParameterDefaultValue(this, defaultSyntax).BindParameterDefaultValue(defaultSyntax, parameterType, diagnostics, out valueBeforeConversion);
bool hasErrors = ParameterHelpers.ReportDefaultParameterErrors(binder, ContainingSymbol, parameterSyntax, this, valueBeforeConversion, diagnostics);
if (hasErrors)
{
return ConstantValue.Bad;
}
// If we have something like M(double? x = 1) then the expression we'll get is (double?)1, which
// does not have a constant value. The constant value we want is (double)1.
if (convertedExpression.ConstantValue == null && convertedExpression.Kind == BoundKind.Conversion)
{
if (parameterType.IsNullableType())
{
convertedExpression = binder.GenerateConversionForAssignment(parameterType.GetNullableUnderlyingType(),
valueBeforeConversion, diagnostics, isDefaultParameter: true);
}
}
// represent default(struct) by a Null constant:
var value = convertedExpression.ConstantValue ?? ConstantValue.Null;
VerifyParamDefaultValueMatchesAttributeIfAny(value, defaultSyntax.Value, diagnostics);
return value;
}