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我们如果想利用凡是给一个对象属性赋值可以通过PropertyInfo.SetValue()方式进行赋值，但要注意值的类型要与属性保持一致，例如：
<p>var property = obj.GetType().GetProperty(“PropertyName”);//此时可以使用GetProperty获取属性数组，循环进行赋值。</p>
<p><strong>该属性类型是已知基本类型可以直接将变量传入</strong>, 例如：string</p>
<p>var value=”wangheng.org”;</p>
<p>property.SetValue(obj，value,null);</p>
<p>这里需要注意value值的类型必须和属性类型一致，否则会抛出<a target="_blank" rel="noopener" href="http://msdn.microsoft.com/zh-cn/library/system.reflection.targetexception.aspx">TargetException</a>异常。</p>
<p>如果原值是其他类型。例如：目标类型为int，值为string</p>
<p>string value=”100”;</p>
<p>property.SetValue(obj，int.TryParse(value),null);//类型转换。</p>
<p>上面几种都比较容易处理，但是如果该属性类型是未知非泛型类型，例如 int?</p>
<p>var value=”100”;</p>
<p>property.SetValue(obj，Convert.ChangeType(value, property.PropertyType), null);//类型转换。这时简单调用 ChangeType()方法，类型会报错。</p>
<p>想解决这个问题，需要首先把属性值类型转成基本类型，然后进行转换。如下：</p>
<pre class="brush: csharp; gutter: true"> if (!property.PropertyType.IsGenericType)
{
//非泛型
property.SetValue(obj, string.IsNullOrEmpty(value) ? null : Convert.ChangeType(value, property.PropertyType), null);
}
else
{
//泛型Nullable<>
Type genericTypeDefinition = property.PropertyType.GetGenericTypeDefinition();
if (genericTypeDefinition == typeof(Nullable<>))
{
property.SetValue(obj, string.IsNullOrEmpty(value) ? null : Convert.ChangeType(value, Nullable.GetUnderlyingType(property.PropertyType)), null);
}
}</pre>
<p>这样，在使用Convert.ChangeType()转换可空类型时，就不会报错了。<br></content></p>
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