我们在后台代码里面操作Entity的时候，基本上是这样写的：
/* 创建者：菜刀居士的博客
* 创建日期：2014年07月5号
*/
namespace Net.CRM.Entity
{
using System;
using Microsoft.Xrm.Sdk;
/// <summary>
/// 基本模式---Entity
/// </summary>
public class EntityDemo
{
public void Run(Entity entity)
{
if (IsNotNull(entity,"new_int"))
{
//获取int类型的字段的值
int new_int = entity.GetAttributeValue<int>("new_int");
}
if (IsNotNull(entity, "new_string"))
{
//获取string类型的字段的值
string new_string = entity.GetAttributeValue<string>("new_string");
}
if (IsNotNull(entity, "new_float"))
{
//获取float类型的字段的值
float new_float = entity.GetAttributeValue<float>("new_float");
}
if (IsNotNull(entity, "new_money"))
{
//获取Money(货币)类型的字段的值
decimal new_money = entity.GetAttributeValue<Money>("new_money").Value;
}
if (IsNotNull(entity, "new_picklist"))
{
//获取OptionSetValue(下拉框)类型的字段的值
int new_picklist = entity.GetAttributeValue<OptionSetValue>("new_picklist").Value;
}
if (IsNotNull(entity, "new_lookup"))
{
//获取EntityReference(引用字段)类型的字段的值
EntityReference new_lookup = entity.GetAttributeValue<EntityReference>("new_lookup");
}
}
/// <summary>
/// 推断实体的某个字段是否为空
/// </summary>
/// <param name="entity">实体</param>
/// <param name="name">字段名称</param>
public bool IsNotNull(Entity entity,string name)
{
return entity.Contains(name) && entity.Attributes[name] != null;
}
}
}
这样写。是正确的，可是。非常繁琐，以下是高速的写法：
/* 创建者：菜刀居士的博客
* 创建日期：2014年07月5号
*/
namespace Net.CRM.Entity
{
using System;
using Microsoft.Xrm.Sdk;
/// <summary>
/// 高速开发---Entity
/// </summary>
public class EntityQuickDemo
{
public void Run(Entity entity)
{
if (entity.IsNotNull("new_int"))
{
//获取int类型的字段的值
int new_int = entity.ToInt("new_int");
}
if (entity.IsNotNull("new_string"))
{
//获取string类型的字段的值
string new_string = entity.ToString("new_string");
}
if (entity.IsNotNull("new_float"))
{
//获取float类型的字段的值
float new_float = entity.ToFloat("new_float");
}
if (entity.IsNotNull("new_money"))
{
//获取Money(货币)类型的字段的值
decimal new_money = entity.ToMoney("new_money");
}
if (entity.IsNotNull("new_picklist"))
{
//获取OptionSetValue(下拉框)类型的字段的值
int new_picklist = entity.ToOpInt("new_picklist");
}
if (entity.IsNotNull("new_lookup"))
{
//获取EntityReference(引用字段)类型的字段的值
EntityReference new_lookup = entity.ToEr("new_lookup");
}
}
}
/// <summary>
/// 扩展方法
/// </summary>
public static class EntityFunction
{
/// <summary>
/// Int
/// </summary>
public static int ToInt(this Entity entity, string name)
{
return entity.GetAttributeValue<int>(name);
}
/// <summary>
/// string
/// </summary>
public static string ToString(this Entity entity, string name)
{
return entity.GetAttributeValue<string>(name);
}
/// <summary>
/// float
/// </summary>
public static float ToFloat(this Entity entity, string name)
{
return entity.GetAttributeValue<float>(name);
}
/// <summary>
/// Money
/// </summary>
public static decimal ToMoney(this Entity entity, string name)
{
return entity.GetAttributeValue<Money>(name).Value;
}
/// <summary>
/// OptionSetValue
/// </summary>
public static int ToOpInt(this Entity entity, string name)
{
return entity.GetAttributeValue<OptionSetValue>(name).Value;
}
/// <summary>
/// EntityReference
/// </summary>
public static EntityReference ToEr(this Entity entity, string name)
{
return entity.GetAttributeValue<EntityReference>(name);
}
public static T GetAttributeValue<T>(this Entity entity, string name)
{
if (entity.IsNotNull(name))
{
return entity.GetAttributeValue<T>(name);
}
return default(T);
}
/// <summary>
/// 推断实体的某个字段是否为空
/// </summary>
/// <param name="entity">实体</param>
/// <param name="name">字段名称</param>
public static bool IsNotNull(this Entity entity, string name)
{
return entity.Contains(name) && entity.Attributes[name] != null;
}
}
}