Here is the scenario I was working with:
I needed to write an extension method that would be able to convert any class to a string representation. The class could have properties that were lists of any type (eg: List<T>), but I wouldn’t know in advance what types might be implemented as lists in the class. Here is the code I came up with. Listed below is the code for metro apps as well as for normal .net apps: (The code to enumerate any object that is a List is highlighted in the code below).
| Metro |
| static class ObjectExtensions
{
public static string Convert(this object obj)
{
var typeInfo = obj.GetType().GetTypeInfo();
var sb = new StringBuilder(); foreach (var info in typeInfo.DeclaredProperties)
{
var val = info.GetValue(obj, null);
string strVal;
if (val != null)
{
var valType = val.GetType();
var valTypeInfo = valType.GetTypeInfo();
if ((val is string)
|| valTypeInfo.IsValueType)
{
strVal = val.ToString();
}
else if (valType.IsArray ||
(valTypeInfo.IsGenericType
&& (valTypeInfo.GetGenericTypeDefinition() == typeof(List<>))))
{
Type genericArgument = valType.GenericTypeArguments[0]; var genericEnumerator =
typeof(System.Collections.Generic.IEnumerable<>)
.MakeGenericType(genericArgument)
.GetTypeInfo()
.GetDeclaredMethod("GetEnumerator")
.Invoke(val, null);
IEnumerator enm = genericEnumerator as IEnumerator;
StringBuilder sbEnum = new StringBuilder();
sbEnum.AppendLine("List:");
while (enm.MoveNext())
{
var item = enm.Current;
sbEnum.AppendLine("Item: " + item.Convert());
}
strVal = sbEnum.ToString();
}
else{
strVal = val.Convert();
}
}
else
{
strVal = "null";
}
sb.AppendLine(info.Name + ": " + strVal);
} return sb.ToString();
}
} |
| Windows .Net |
| static class ObjectExtensions
{
public static string Convert(this object obj)
{
var props = obj.GetType().GetProperties();
var sb = new StringBuilder(); foreach (var info in props)
{
var val = info.GetValue(obj, null);
string strVal;
if (val != null)
{
var valType = val.GetType();
if ((val is string)
|| valType.IsValueType)
{
strVal = val.ToString();
}
else if (valType.IsArray ||
(valType.IsGenericType
&& (valType.GetGenericTypeDefinition() == typeof(List<>))))
{
Type genericArgument = valType.GetGenericArguments()[0]; var genericEnumerator =
typeof(System.Collections.Generic.IEnumerable<>)
.MakeGenericType(genericArgument)
.GetMethod("GetEnumerator")
.Invoke(val, null);
IEnumerator enm = genericEnumerator as IEnumerator;
StringBuilder sbEnum = new StringBuilder();
sbEnum.AppendLine("List:");
while (enm.MoveNext())
{
var item = enm.Current;
sbEnum.AppendLine("Item: " + item.Convert());
}
strVal = sbEnum.ToString();
}
else
{
strVal = val.Convert();
}
}
else
{
strVal = "null";
}
sb.AppendLine(info.Name + ": " + strVal);
} return sb.ToString();
}
} |
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