public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
CustomProperty prop = null;
PropertyDescriptor[] newProps = new PropertyDescriptor[this.Count];
try
{
for (int i = 0; i < this.Count; i++)
{
CustomProperty curprop = (CustomProperty)this[i];
if (curprop.Visible == true)
{
prop = curprop;
newProps[i] = new CustomPropertyDescriptor(ref prop, attributes);
}
}
}
catch (Exception ex)
{
string s = string.Format("在读取 {0} 字段时出现错误，请修改元信息描述数据表。\r\n错误讯息为:{1}", prop.ID, ex.Message);
System.Windows.Forms.MessageBox.Show(s);
}
return(new PropertyDescriptorCollection(newProps));
}
public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
if (context.Instance is CustomClass)
{
CustomPropertyDescriptor desc = (CustomPropertyDescriptor)context.PropertyDescriptor;
if (desc.Property.Value is CustomClass)
{
desc.Property.SetValue(value);
/*
* DBCustomClass cls = (DBCustomClass)desc.Property.Value;
* cls.Value = value;
* cls.GetDynamicClass(new object[]{value});
* while (cls.Parent != null)
* {
* if (cls.Parent is DBCustomClass)
* {
* cls = (DBCustomClass)(cls.Parent);
* }
* }
* cls.OnAsynNotifyEvent(1);
*/
return(desc.Property.Value);
}
}
return(base.ConvertFrom(context, culture, value));
}
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destType)
{
if (destType == typeof(string) && context.Instance is CustomClass)
{
CustomPropertyDescriptor desc = (CustomPropertyDescriptor)context.PropertyDescriptor;
if (desc.Property.Value is CustomClass)
{
CustomClass cls = (CustomClass)context.Instance;
object ovalue = null;
try
{
CustomClass childclass = (CustomClass)desc.Property.Value;
//string strdesc = childclass.Value == null ? "" : childclass.Value;
//ovalue = cls.OnCustomGetTreeValue(childclass, strdesc);
ovalue = cls.OnCustomGetTreeValue((CustomProperty)desc.Property);//, strdesc);
if (ovalue == null)
{
if (childclass.DisplayValue == null)
{
return(childclass.Value.ToString());
}
else
{
return(childclass.DisplayValue);
}
}
else
{
return(ovalue.ToString());
}
//else
// return "...";
}
catch
{
}
/*CustomClass cls = (CustomClass)desc.Property.Value;
* string strValue = "";
* foreach(CustomProperty prop in cls)
* {
* strValue = strValue + prop.ID + " = " + prop.Value + " ";
* }
*/
//return ((CustomClass)desc.Property.Value).Description;
}
}
return(base.ConvertTo(context, culture, value, destType));
}
public object DoEditValue(CustomClass instance, CustomPropertyDescriptor descriptor, object value)
{
object newvalue = instance.OnCustomEditValue(descriptor.Property, value);
if (value is CustomClass)
{
object newrealvalue = newvalue is CustomClass ? (newvalue as CustomClass).Value : newvalue;
if (!(value as CustomClass).Value.Equals(newrealvalue))
{
descriptor.Property.SetValue(newrealvalue);
}
}
return(newvalue == null ? value : newvalue);
}
public object DoEditValue(CustomPropertyDescriptor descriptor, object value)
{
string strPrePath;// = ((CustomPropertyDescriptor)context.PropertyDescriptor).Property.Prefix;
string filenamefilter = Path.GetFileName(descriptor.Property.Prefix);
//oldvalue 要处理为绝对路径
string stroldvalue = value.ToString().Trim();
object oldvalue;
string strRootDir = Helper.AddSlash(Program.RootDir);
string strCutDir;
if (stroldvalue.Length > 0) //已经有值,则直接与rootdir组合
{
oldvalue = Helper.CombinePaths(strRootDir, stroldvalue);
strPrePath = strRootDir;
strCutDir = Helper.AddSlash(descriptor.Property.CutPrefix);
}
else
{
strPrePath = descriptor.Property.Prefix;
strCutDir = Helper.AddSlash(descriptor.Property.CutPrefix);
oldvalue = Helper.CombinePaths(strPrePath, stroldvalue);
}
object newvalue = NewEditValue(oldvalue, filenamefilter); //base.EditValue(context, provider, oldvalue);
if (!newvalue.Equals(oldvalue) && newvalue != oldvalue)
{
//newvalue要处理成相对路径
//string[] newvaluearray = Helper.split(newvalue.ToString().ToLower(), strPrePath.ToLower());
//string[] newvaluearray = Helper.split(newvalue.ToString().ToLower(), strRootDir.ToLower());
string[] newvaluearray = Helper.split(newvalue.ToString().ToLower(), strCutDir.ToLower());
if (newvaluearray != null && newvaluearray.Length > 1)
{
string strvalue = newvalue.ToString();
newvalue = strvalue.Substring(strvalue.Length - newvaluearray[1].Length);
newvalue = descriptor.Property.CutPreSlash ? newvalue : ("\\" + newvalue);
}
else
{
//return value; //不正确的路径文件，还原为原始文件
throw new Exception("不正确的文件，可能是您没有选择正确路径下的文件。");
}
}
else
{
return(value);//还原为原始的相对的路径
}
return(newvalue);
}
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (sourceType == typeof(string) && context.Instance is CustomClass)
{
CustomPropertyDescriptor desc = (CustomPropertyDescriptor)context.PropertyDescriptor;
if (desc.Property.Value is CustomClass)
{
DBCustomClass cls = ((DBCustomClass)(desc.Property.Value));
if (!cls.IsVirtualField) //虚拟字段本身不能修改值
{
return(true);
}
}
}
return(base.CanConvertFrom(context, sourceType));
}