检查的ToString前空（） [英] Checking for null before ToString()

问题描述

下面的情景......

Here's the scenario...

if (entry.Properties["something"].Value != null)
  attribs.something = entry.Properties["something"].Value.ToString();

虽然有效，工作正常，这看起来丑陋的我。如果我执行的ToString前没有检查空（），那么它抛出，如果属性为null异常。有没有更好的方式来处理这种情况？

While effective and working correctly, this looks ugly to me. If I don't check for a null before performing the ToString() then it throws an exception if the property was null. Is there a better way to handle this scenario?

许多AP preciated！

Much appreciated!

推荐答案

（编辑以实际工作:)）

(edited to actually work :) )

object defaultValue = "default";
attribs.something = (entry.Properties["something"].Value ?? defaultValue).ToString()

编辑：我也采取了利用这一点，这是不是非常聪明，但方便的：

I've also taken to using this, which isn't terribly clever but convenient:

public static string ToSafeString(this object obj)
{
    return (obj ?? string.Empty).ToString();
}

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