public static Dictionary <string, string> BuildColumns(Expression expression, Dictionary <string, object> param, bool singleTable = true)
{
var columns = new Dictionary <string, string>();
if (expression is LambdaExpression)
{
expression = (expression as LambdaExpression).Body;
}
if (expression is MemberInitExpression)
{
var initExpression = (expression as MemberInitExpression);
for (int i = 0; i < initExpression.Bindings.Count; i++)
{
var column = string.Empty;
Expression argument = (initExpression.Bindings[i] as MemberAssignment).Expression;
if (argument is UnaryExpression)
{
argument = (argument as UnaryExpression).Operand;
}
if (argument is MethodCallExpression && (argument as MethodCallExpression).Method.DeclaringType == typeof(Convert))
{
column = GetValue((argument as MethodCallExpression).Arguments[0]).ToString();
}
else if (argument is ConstantExpression || (argument is MemberExpression && (argument as MemberExpression).Expression is ConstantExpression))
{
column = GetValue(argument).ToString();
}
else
{
column = BuildExpression(argument, param, singleTable);
}
var name = initExpression.Bindings[i].Member.Name;
columns.Add(name, column);
}
}
else if (expression is NewExpression)
{
var newExpression = (expression as NewExpression);
for (int i = 0; i < newExpression.Arguments.Count; i++)
{
var columnName = string.Empty;
var argument = newExpression.Arguments[i];
if (argument is MethodCallExpression && (argument as MethodCallExpression).Method.DeclaringType == typeof(Convert))
{
columnName = GetValue((argument as MethodCallExpression).Arguments[0]).ToString();
}
else if (argument is ConstantExpression || (argument is MemberExpression && (argument as MemberExpression).Expression is ConstantExpression))
{
columnName = GetValue(argument).ToString();
}
else
{
columnName = BuildExpression(argument, param, singleTable);
}
var name = newExpression.Members[i].Name;
columns.Add(name, columnName);
}
}
else if (expression is MemberExpression)
{
var memberExpression = (expression as MemberExpression);
var name = memberExpression.Member.Name;
var columnName = EntityUtil.GetColumn(memberExpression.Expression.Type, f => f.CSharpName == name)?.ColumnName ?? name;
if (!singleTable)
{
var tableName = EntityUtil.GetTable(memberExpression.Expression.Type).TableName;
columnName = string.Format("{0}.{1}", tableName, columnName);
}
columns.Add(name, columnName);
}
else
{
var name = string.Format("COLUMN0");
var columnName = BuildExpression(expression, param, singleTable);
columns.Add(name, columnName);
}
return(columns);
}
