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[英]Is there a way I can do a foreach that contains code in a LINQ expression?
[英]How can I rewrite this foreach to be a part of the previous Linq expression?
我正在用自定义属性, SpecificationAttribute
和VerificationAttribute
装饰我的MSTest测试,以后将它们用于生成html测试规范报告。
属性如下所示:
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public class SpecificationAttribute : Attribute
{
public SpecificationAttribute(int step, string text)
{
Step = step;
Text = text;
}
public int Step { get; set; }
public string Text { get; set; }
}
我编写了一个测试,该测试断言测试方法在使用属性时必须具有唯一的步骤。 例如,以下用法未能通过我的测试,因为它应该:
[Specification(1, "Click Button)]
[Verification(1, "Verify popup")]
[Specification(1, "Click close")]
[Verification(2, "Verify popup disappears")]
我的测试看起来像这样:
[TestMethod]
public void TestForNoDuplicateStepsOnMethod()
{
var specificationMethods = Assembly.GetExecutingAssembly().GetTypes()
.Where(type =>
type.GetCustomAttribute<CompilerGeneratedAttribute>() == null &&
type.GetCustomAttribute<TestClassAttribute>() != null)
.SelectMany(type => type.GetMethods())
.Where(methodInfo =>
methodInfo.GetCustomAttribute<TestMethodAttribute>() != null &&
methodInfo.GetCustomAttributes<SpecificationAttribute>().Any())
.ToArray();
foreach (var method in specificationMethods)
{
var specificationAttributes = method.GetCustomAttributes<SpecificationAttribute>();
var duplicates = specificationAttributes.GroupBy(s => s.Step).Where(grp => grp.Count() > 1).SelectMany(x => x).ToList();
if (duplicates.Any())
{
var initialMessage = $@"{Environment.NewLine}{method.DeclaringType}.{method.Name} contains several SpecificationAttribute with the same step number." + Environment.NewLine + Environment.NewLine;
var message = duplicates.Aggregate(initialMessage, (s, attribute) => s + attribute.Step + " " + attribute.Text + Environment.NewLine);
Assert.Fail(message);
}
}
}
我想重写最后一部分,使其成为Linq查询的一部分。 这可能吗? 另外,我当前的测试仅输出一种失败的方法。 如果Linq查询可以包括在唯一步骤号上具有失败条件的所有方法,那将是可取的。
如果您不需要对var SpecificationMethods进行更多操作,则可以尝试以下操作:
[TestMethod]
public void TestForNoDuplicateStepsOnMethod()
{
Assembly.GetExecutingAssembly().GetTypes()
.Where(type =>
type.GetCustomAttribute<CompilerGeneratedAttribute>() == null &&
type.GetCustomAttribute<TestClassAttribute>() != null)
.SelectMany(type => type.GetMethods())
.Where(methodInfo =>
methodInfo.GetCustomAttribute<TestMethodAttribute>() != null &&
methodInfo.GetCustomAttributes<SpecificationAttribute>().Any())
.ToList().ForEach (method=>
{
var specificationAttributes = method.GetCustomAttributes<SpecificationAttribute>();
var duplicates = specificationAttributes.GroupBy(s => s.Step).Where(grp => grp.Count() > 1).SelectMany(x => x).ToList();
if (duplicates.Any())
{
var initialMessage = $@"{Environment.NewLine}{method.DeclaringType}.{method.Name} contains several SpecificationAttribute with the same step number." + Environment.NewLine + Environment.NewLine;
var message = duplicates.Aggregate(initialMessage, (s, attribute) => s + attribute.Step + " " + attribute.Text + Environment.NewLine);
Assert.Fail(message);
}
}
}
}
(经过编辑以通过积极的测试解决该问题)尝试此操作,但是恕我直言,它很难阅读。
[TestMethod]
public void TestForNoDuplicateStepsOnMethod()
{
var errors = Assembly.GetExecutingAssembly().GetTypes()
.Where(type =>
type.GetCustomAttribute<CompilerGeneratedAttribute>() == null &&
type.GetCustomAttribute<TestClassAttribute>() != null)
.SelectMany(type => type.GetMethods())
.Where(methodInfo =>
methodInfo.GetCustomAttribute<TestMethodAttribute>() != null &&
methodInfo.GetCustomAttributes<SpecificationAttribute>().Any())
.Select(method =>
method.GetCustomAttributes<SpecificationAttribute>()
.GroupBy(s => s.Step)
.Where(grp => grp.Count() > 1)
.Select(x => x.Aggregate(
$@"{Environment.NewLine}{method.DeclaringType}.{method.Name} contains several SpecificationAttribute with the same step number."
+ Environment.NewLine,
(s, attribute) => s + attribute.Step + " " + attribute.Text + Environment.NewLine))
.Aggregate("", (s, message) => s + message))
.Aggregate("", (s, message) => s + message);
Assert.AreEqual("", errors);
}
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