ReSharper的 - 可能空分配使用Microsoft.Contracts时 [英] ReSharper - Possible Null Assignment when using Microsoft.Contracts

问题描述

有什么办法来指示该ReSharper的空引用并不会因为设计按合同要求检查的发生？例如，下面的code将提高预警（可能空分配到实体标有'NOTNULL'属性）的ReSharper的上线7和8：

Is there any way to indicate to ReSharper that a null reference won't occur because of Design-by-Contract Requires checking? For example, the following code will raise the warning (Possible 'null' assignment to entity marked with 'NotNull' attribute) in ReSharper on lines 7 and 8:

private Dictionary<string, string> _Lookup = new Dictionary<string, string>();

public void Foo(string s)
{
    Contract.Requires(!String.IsNullOrEmpty(s));

    if (_Lookup.ContainsKey(s))
        _Lookup.Remove(s);
}

什么是真正奇怪的是，如果你删除 Contract.Requires（...）行，ReSharper的消息消失。

What is really odd is that if you remove the Contract.Requires(...) line, the ReSharper message goes away.

更新

我通过这也是麦克下面提到ExternalAnnotations找到了解决办法。下面是如何做到这一点在Microsoft.Contracts函数的例子：

I found the solution through ExternalAnnotations which was also mentioned by Mike below. Here's an example of how to do it for a function in Microsoft.Contracts:

• 创建一个名为 Microsoft.Contracts 的 ExternalAnnotations ReSharper的目录下。


• 接下来，创建一个名为 Microsoft.Contracts.xml 文件和填充像这样：

• Create a directory called Microsoft.Contracts under the ExternalAnnotations ReSharper directory.
• Next, Create a file called Microsoft.Contracts.xml and populate like so:

<assembly name="Microsoft.Contracts">
    <member name="M:System.Diagnostics.Contracts.Contract.Requires(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
</assembly>

• 重新启动Visual Studio，并且此消息消失！

推荐答案

注意：作为当前R·8.0 EAP的，此功能包含

Note: as of the current R# 8.0 EAP, this functionality is included.

下面是code合同的电流（即.NET 4.0）版本的解决方案：

Here's the solution for the current (i.e. .NET 4.0) version of Code Contracts:

在 ... \\ ExternalAnnotations \\ mscorlib程序\\ Contracts.xml ，添加以下内容：

<assembly name="mscorlib">
    <member name="M:System.Diagnostics.Contracts.Contract.Assert(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Assert(System.Boolean, System.String)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Assume(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Assume(System.Boolean, System.String)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Requires(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Requires``1(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Requires(System.Boolean,System.String)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Requires``1(System.Boolean,System.String)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Invariant(System.Boolean)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
    <member name="M:System.Diagnostics.Contracts.Contract.Invariant(System.Boolean,System.String)">
        <attribute ctor="M:JetBrains.Annotations.AssertionMethodAttribute.#ctor"/>
        <parameter name="condition">
            <attribute ctor="M:JetBrains.Annotations.AssertionConditionAttribute.#ctor(JetBrains.Annotations.AssertionConditionType)">
                <argument>0</argument>
            </attribute>
        </parameter>
    </member>
</assembly>

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