protected override Expression VisitMethodCall(MethodCallExpression node)
{
var result = new FunctionExpressionResovle(node).Resovle();
_textBuilder.Append($"{result}{_asc},");
return(node);
}
protected override Expression VisitNew(NewExpression node)
{
for (int i = 0; i < node.Arguments.Count; i++)
{
var item = node.Arguments[i];
var column = node.Members[i].Name;
if (item is MemberExpression member)
{
var name = GetColumnName(member.Member.DeclaringType, member.Member.Name);
if (name != column)
{
_textBuilder.Append($"{name} AS {column}");
}
else
{
_textBuilder.Append($"{name}");
}
}
else if (item is MethodCallExpression)
{
var expression = new FunctionExpressionResovle(item).Resovle();
_textBuilder.Append($"{expression} AS {column}");
}
if (i != node.Arguments.Count - 1)
{
_textBuilder.Append(",");
}
}
return(node);
}
protected override Expression VisitMemberInit(MemberInitExpression node)
{
for (int i = 0; i < node.Bindings.Count; i++)
{
var item = node.Bindings[i] as MemberAssignment;
if (item.Expression is MemberExpression member)
{
var name = GetColumnName(member.Member.DeclaringType, member.Member.Name);
_textBuilder.Append($"{name} AS {item.Member.Name}");
}
else if (item.Expression is MethodCallExpression)
{
var expression = new FunctionExpressionResovle(item.Expression).Resovle();
_textBuilder.Append($"{expression} AS {item.Member.Name}");
}
if (i != node.Bindings.Count - 1)
{
_textBuilder.Append(",");
}
}
return(node);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.DeclaringType == typeof(Operator))
{
if (node.Arguments.Count == 2)
{
_textBuilder.Append("(");
SetParameterName(node.Arguments[0] as MemberExpression);
var type = Operator.ResovleExpressionType(node.Method.Name);
_textBuilder.Append($" {type} ");
var value = VisitConstantValue(node.Arguments[1]);
if (node.Method.Name == nameof(Operator.StartsWith) || node.Method.Name == nameof(Operator.NotStartsWith))
{
SetParameterValue(Expression.Constant($"{value}%", typeof(string)));
}
else if (node.Method.Name == nameof(Operator.EndsWith) || node.Method.Name == nameof(Operator.NotEndsWith))
{
SetParameterValue(Expression.Constant($"%{value}", typeof(string)));
}
else if (node.Method.Name == nameof(Operator.Contains) || node.Method.Name == nameof(Operator.NotContains))
{
SetParameterValue(Expression.Constant($"%{value}%", typeof(string)));
}
else
{
SetParameterValue(Expression.Constant(value));
}
_textBuilder.Append(")");
}
}
else if (IsLikeExpression(node))
{
_textBuilder.Append("(");
object value = null;
if (IsParameterExpression(node.Object))
{
SetParameterName(node.Object as MemberExpression);
value = VisitConstantValue(node.Arguments[0]);
}
else
{
SetParameterName(node.Arguments[0] as MemberExpression);
value = VisitConstantValue(node.Object);
}
if (_isNotExpression)
{
_isNotExpression = false;
_textBuilder.Append(" NOT LIKE ");
}
else
{
_textBuilder.Append(" LIKE ");
}
if (node.Method.Name == nameof(string.Contains))
{
SetParameterValue(Expression.Constant($"%{value}%"));
}
else if (node.Method.Name == nameof(string.StartsWith))
{
SetParameterValue(Expression.Constant($"{value}%"));
}
else
{
SetParameterValue(Expression.Constant($"%{value}"));
}
_textBuilder.Append(")");
}
else if (IsInExpression(node))
{
_textBuilder.Append("(");
SetParameterName(node.Arguments[1] as MemberExpression);
if (_isNotExpression)
{
_isNotExpression = false;
_textBuilder.Append(" NOT IN ");
}
else
{
_textBuilder.Append(" IN ");
}
SetParameterValue(node.Arguments[0] as MemberExpression);
_textBuilder.Append(")");
}
else if (node.Method.DeclaringType.GetCustomAttribute(typeof(FunctionAttribute), true) != null)
{
var function = new FunctionExpressionResovle(node).Resovle();
_textBuilder.Append(function);
}
else
{
SetParameterValue(node);
}
return(node);
}
