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数据流覆盖范围(Data Flow Coverage)

 如果您编写程序，通常可以驱动程序以覆盖所有路径。 因此，100％的覆盖率很容易获得（忽略现代编译器无法捕获的不可行的代码路径）。  
 但是，100％的代码覆盖率应该意味着所有变量定义使用覆盖率也都会实现，因为变量是在程序中定义的并在其中使用。 如果涵盖所有代码，则还应涵盖所有DU对。  
 那么，为什么它说路径覆盖更容易获得，但数据流覆盖通常不可能达到100％？ 我不明白为什么不呢？ 有什么例子呢？ 

If you write a program, it is usually possible to drive it such that all paths are covered. Hence, 100% coverage is easy to obtain (ignoring unfeasible code paths which modern compilers catch anyways). 
However, 100% code coverage should imply that all variable definition-use coverage is also achieved, because variables are defined within the program and used within it. If all code is covered, all DU pairs should also be covered. 
Why then, is it said that path coverage is easier to obtain, but data flow coverage is not usually possible to achieve 100% ? I do not understand why not? What can be an example of that?

原文：https://stackoverflow.com/questions/19884711

更新时间：2022-05-16 09:05

最满意答案

 当您实际只需要一个字典时，您当前正在将其反序列化为字典列表。  
 可能有一种更简洁的方法，但您可以将其反序列化为键值对列表，然后将其转换为字典。 示例代码：  
using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;

public class Test
{
    static void Main()
    {
        string json = "[{'Key':'x','Value':'y'},{'Key':'a','Value':'b'}]";

        var dictionary = JsonConvert.DeserializeObject<List<KeyValuePair<string, string>>>(json)
            .ToDictionary(pair => pair.Key, pair => pair.Value);

        Console.WriteLine(dictionary["x"]); // y
        Console.WriteLine(dictionary["a"]); // b
    }
}

You're currently deserializing it as a list of dictionaries, when you only actually want a single dictionary. 
There may be a cleaner way of doing this, but you can deserialize it as a list of key-value pairs, then convert that into a dictionary. Sample code: 
using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;

public class Test
{
    static void Main()
    {
        string json = "[{'Key':'x','Value':'y'},{'Key':'a','Value':'b'}]";

        var dictionary = JsonConvert.DeserializeObject<List<KeyValuePair<string, string>>>(json)
            .ToDictionary(pair => pair.Key, pair => pair.Value);

        Console.WriteLine(dictionary["x"]); // y
        Console.WriteLine(dictionary["a"]); // b
    }
}

数据流覆盖范围(Data Flow Coverage)

最满意答案

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