我正在尝试编写一个通用方法来比较两个对象(我有意引入两种不同的类型。第二个具有与第一个相同的属性。第一个具有更多属性。)。
我想确保属性具有相同的值。以下代码适用于我在对象中拥有的大多数属性,但偶尔会抛出:
"Object Does Not Match Target Type"
...错误在
var valFirst = prop.GetValue(manuallyCreated, null) as IComparable;
public static bool SameCompare<T, T2>(T manuallyCreated, T2 generated){
var propertiesForGenerated = generated.GetType().GetProperties();
int compareValue = 0;
foreach (var prop in propertiesForGenerated) {
var valFirst = prop.GetValue(manuallyCreated, null) as IComparable;
var valSecond = prop.GetValue(generated, null) as IComparable;
if (valFirst == null && valSecond == null)
continue;
else if (valFirst == null) {
System.Diagnostics.Debug.WriteLine(prop + "s are not equal");
return false;
}
else if (valSecond == null) {
System.Diagnostics.Debug.WriteLine(prop + "s are not equal");
return false;
}
else if (prop.PropertyType == typeof(System.DateTime)) {
TimeSpan timeDiff = (DateTime)valFirst - (DateTime)valSecond;
if (timeDiff.Seconds != 0) {
System.Diagnostics.Debug.WriteLine(prop + "s are not equal");
return false;
}
}
else
compareValue = valFirst.CompareTo(valSecond);
if (compareValue != 0) {
System.Diagnostics.Debug.WriteLine(prop + "s are not equal");
return false;
}
}
System.Diagnostics.Debug.WriteLine("All values are equal");
return true;
}
最佳答案
在 .NET 中为一个类型定义的每个属性都是不同的,即使它们具有相同的名称。你必须这样做:
foreach (var prop in propertiesForGenerated)
{
var otherProp = typeof(T).GetProperty(prop.Name);
var valFirst = otherProp.GetValue(manuallyCreated, null) as IComparable;
var valSecond = prop.GetValue(generated, null) as IComparable;
...
当然这没有考虑到 T
上定义的某些属性可能不存在于 T2
上,反之亦然。
关于C# - GetValue - 对象与目标类型不匹配,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17177671/