private static object GetValueOfMethadCallExpression(MethodCallExpression expression, SqlPack sqlPack)
{
object result = "";
if (expression.Object != null)
{
if (expression.Object is MemberExpression)
{
var memberExp = expression.Object as MemberExpression;
result = GetValueOfMemberExpression(memberExp, sqlPack);
}
else if (expression.Object is ConstantExpression)
{
var constantExp = expression.Object as ConstantExpression;
if (constantExp != null)
{
result = (constantExp.GetValueOfExpression(sqlPack));
}
}
else if (expression.Object is MethodCallExpression)
{
var constantExp = expression.Object as MethodCallExpression;
if (constantExp != null)
{
result = MethodCallFluentExpressionSQL.GetMethodResult(constantExp, sqlPack, true);
}
}
}
return(result);
}
//public static object GetValueOfExpressionWithoutFormat(this Expression body )
//{
// if (body == null)
// {
// return string.Empty;
// }
// if (body is ConstantExpression)
// {
// return ((ConstantExpression)body).Value;
// }
// if (body is MemberExpression)
// {
// var member = ((MemberExpression)body);
// var value = GetValueOfMemberExpression(member);
// Type typeOfValue = null;
// if (value != null)
// {
// typeOfValue = value.GetType();
// }
// return (value);
// }
// if (body is UnaryExpression)
// {
// return GetValueOfExpressionWithoutFormat(((UnaryExpression)body).Operand);
// }
// if (body is NewExpression)
// {
// var args = ((NewExpression)body).Arguments;
// //判断Select设置值 Select<UserInfo>(u => new { DT3=new DateTime(2015,10,11) }).
// if (args.Count > 0)
// {
// return GetValueOfExpressionWithoutFormat(args[0]);
// }
// //foreach (var item in ((NewExpression)body).Arguments)
// //{
// // GetValueOfExpression(item, sqlpack);
// //}
// }
// //if (body is BinaryExpression)
// //{
// // var binary = body as BinaryExpression;
// // if (binary.Right.GetValueOfExpressionWithoutFormat() == null && (binary.NodeType == ExpressionType.Equal || binary.NodeType == ExpressionType.NotEqual))
// // {
// // return string.Format("({0}{1}{2})", GetValueOfExpression(binary.Left, sqlpack),
// // ConvertExpressionTypeToString(binary.NodeType, true),
// // "NULL");
// // }
// // else
// // {
// // return string.Format("({0}{1}{2})", GetValueOfExpression(binary.Left, sqlpack),
// // ConvertExpressionTypeToString(binary.NodeType),
// // GetValueOfExpression(binary.Right, sqlpack));
// // }
// //}
// //if (body is MethodCallExpression)
// //{
// // var method = body as MethodCallExpression;
// // return MethodCallFluentExpressionSQL.GetMethodResult(method, sqlpack);
// //}
// if (body is LambdaExpression)
// {
// return GetValueOfExpressionWithoutFormat(((LambdaExpression)body).Body);
// }
// return "";
//}
public static object GetValueOfExpression(this Expression body, SqlPack sqlpack, bool needFormat = true)
{
if (body == null)
{
return(string.Empty);
}
if (body is ConstantExpression)
{
return(FormatValue(((ConstantExpression)body).Value, sqlpack, needFormat));
}
if (body is MemberExpression)
{
var member = ((MemberExpression)body);
if (member.Member.MemberType == MemberTypes.Property)
{
if (member.Member.DeclaringType == ResolveConstants.TypeOfDateTime)//日期转换
{
if (member.Member == ResolveConstants.PropertyInfo_DateTime_Now ||
member.Member == ResolveConstants.PropertyInfo_DateTime_UtcNow ||
member.Member == ResolveConstants.PropertyInfo_DateTime_Today)//只能转换为常量的SQL 字符
{
object valueDatetime = sqlpack.SqlDialectProvider.ConvertDateTime(member.Member, null);
return(valueDatetime);
}
}
string tableName = GetTableNameByExpression(member, sqlpack);
sqlpack.SetTableAlias(tableName);
string tableAlias = sqlpack.GetTableAlias(tableName);
if (!string.IsNullOrWhiteSpace(tableAlias))
{
tableAlias += ".";
}
return(tableAlias + member.Member.Name);
//return member.Member.Name;
}
var value = GetValueOfMemberExpression(member);
Type typeOfValue = null;
if (value != null)
{
typeOfValue = value.GetType();
}
if (IsListType(typeOfValue))
{
var valueList = value as IEnumerable;
var sb = new StringBuilder();
foreach (var item in value as IEnumerable)
{
sb.AppendFormat("{0},", FormatValue(item, sqlpack, needFormat));
}
if (sb.Length == 0)
{
return("");
}
return(sb.Remove(sb.Length - 1, 1).ToString());
}
else
{
return(FormatValue(value, sqlpack, needFormat));
}
}
if (body is UnaryExpression)
{
return(GetValueOfExpression(((UnaryExpression)body).Operand, sqlpack, needFormat));
}
if (body is NewExpression)
{
var args = ((NewExpression)body).Arguments;
//判断Select设置值 Select<UserInfo>(u => new { DT3=new DateTime(2015,10,11) }).
if (args.Count > 0)
{
return(GetValueOfExpression(args[0], sqlpack, needFormat));
}
//foreach (var item in ((NewExpression)body).Arguments)
//{
// GetValueOfExpression(item, sqlpack);
//}
}
if (body is BinaryExpression)
{
var binary = body as BinaryExpression;
if (binary.Right.GetValueOfExpression(sqlpack, needFormat) == null && (binary.NodeType == ExpressionType.Equal || binary.NodeType == ExpressionType.NotEqual))
{
return(string.Format("({0}{1}{2})", GetValueOfExpression(binary.Left, sqlpack, needFormat),
ConvertExpressionTypeToString(binary.NodeType, true),
"NULL"));
}
else
{
return(string.Format("({0}{1}{2})", GetValueOfExpression(binary.Left, sqlpack, needFormat),
ConvertExpressionTypeToString(binary.NodeType),
GetValueOfExpression(binary.Right, sqlpack, needFormat)));
}
}
if (body is MethodCallExpression)
{
var method = body as MethodCallExpression;
return(MethodCallFluentExpressionSQL.GetMethodResult(method, sqlpack, needFormat));
//return string.Format("({0} IN ({1}))", GetValueOfExpression(method.Arguments[0], sqlpack),
// GetValueOfExpression(method.Object, sqlpack));
}
if (body is LambdaExpression)
{
return(GetValueOfExpression(((LambdaExpression)body).Body, sqlpack, needFormat));
}
return("");
}