前辈又是你回答我啊。看了SqlMapper的代码，我把那些条件也都加上了，不过枚举希望能够实现上面的效果，因为要绑定到dataGridView1，如果转换的值不是red、green，而是1，2这样的值就会报错。
还有SqlMapper貌似没有加上缓存哦
private class BuilderKey
{
private readonly List<string> _dataRecordNames;
private readonly Type _destinationType;
public BuilderKey(Type destinationType, IDataRecord record)
{
_destinationType = destinationType;
_dataRecordNames = new List<string>(record.FieldCount);
for (int i = 0; i < record.FieldCount; i++)
{
_dataRecordNames.Add(record.GetName(i));
}
}
public override int GetHashCode()
{
int hash = _destinationType.GetHashCode();
foreach (var name in _dataRecordNames)
{
hash = hash * 37 + name.GetHashCode();
}
return hash;
}
public override bool Equals(object obj)
{
var builderKey = obj as BuilderKey;
if (builderKey == null)
return false;
if (this._dataRecordNames.Count != builderKey._dataRecordNames.Count)
return false;
for (int i = 0; i < _dataRecordNames.Count; i++)
{
if (this._dataRecordNames[i] != builderKey._dataRecordNames[i])
return false;
}
return true;
}
}
}
private static Hashtable cache = Hashtable.Synchronized(new Hashtable());//缓存
BuilderKey builderKey = new BuilderKey(destinationType, dataRecord);
DynamicBuilder<T> dynamicBuilder = (DynamicBuilder<T>)cache[builderKey];
if (dynamicBuilder != null)
return dynamicBuilder;
dynamicBuilder = new DynamicBuilder<T>();
...
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
cache[builderKey] = dynamicBuilder;
可以性能会有更一步提高哦。
qin_shili@qq.com谢谢哈
看来也只能这样了
