忽略
This commit is contained in:
“wanyongkang”
@@ -1,144 +1,144 @@
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace Hncore.Infrastructure.EntitiesExtension
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{
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internal class ConditionBuilder : ExpressionVisitor
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{
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private List<object> m_arguments;
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private Stack<string> m_conditionParts;
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public string Condition { get; private set; }
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public object[] Arguments { get; private set; }
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public void Build(Expression expression)
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{
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PartialEvaluator evaluator = new PartialEvaluator();
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Expression evaluatedExpression = evaluator.Eval(expression);
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this.m_arguments = new List<object>();
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this.m_conditionParts = new Stack<string>();
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this.Visit(evaluatedExpression);
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this.Arguments = this.m_arguments.ToArray();
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this.Condition = this.m_conditionParts.Count > 0 ? this.m_conditionParts.Pop() : null;
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}
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protected override Expression VisitBinary(BinaryExpression b)
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{
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if (b == null) return b;
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string opr;
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switch (b.NodeType)
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{
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case ExpressionType.Equal:
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opr = "=";
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break;
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case ExpressionType.NotEqual:
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opr = "<>";
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break;
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case ExpressionType.GreaterThan:
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opr = ">";
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break;
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case ExpressionType.GreaterThanOrEqual:
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opr = ">=";
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break;
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case ExpressionType.LessThan:
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opr = "<";
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break;
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case ExpressionType.LessThanOrEqual:
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opr = "<=";
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break;
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case ExpressionType.AndAlso:
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opr = "AND";
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break;
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case ExpressionType.OrElse:
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opr = "OR";
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break;
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case ExpressionType.Add:
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opr = "+";
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break;
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case ExpressionType.Subtract:
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opr = "-";
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break;
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case ExpressionType.Multiply:
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opr = "*";
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break;
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case ExpressionType.Divide:
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opr = "/";
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break;
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default:
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throw new NotSupportedException(b.NodeType + "is not supported.");
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}
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this.Visit(b.Left);
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this.Visit(b.Right);
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string right = this.m_conditionParts.Pop();
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string left = this.m_conditionParts.Pop();
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string condition = String.Format("({0} {1} {2})", left, opr, right);
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this.m_conditionParts.Push(condition);
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return b;
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}
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protected override Expression VisitConstant(ConstantExpression c)
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{
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if (c == null) return c;
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this.m_arguments.Add(c.Value);
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this.m_conditionParts.Push(String.Format("{{{0}}}", this.m_arguments.Count - 1));
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return c;
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}
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protected override Expression VisitMemberAccess(MemberExpression m)
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{
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if (m == null) return m;
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PropertyInfo propertyInfo = m.Member as PropertyInfo;
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if (propertyInfo == null) return m;
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this.m_conditionParts.Push(String.Format("[{0}]", propertyInfo.Name));
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return m;
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}
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protected override Expression VisitMethodCall(MethodCallExpression m)
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{
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if (m == null) return m;
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string format;
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switch (m.Method.Name)
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{
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case "StartsWith":
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format = "({0} LIKE {1}+'%')";
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break;
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case "Contains":
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format = "({0} LIKE '%'+{1}+'%')";
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break;
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case "EndsWith":
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format = "({0} LIKE '%'+{1})";
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break;
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default:
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throw new NotSupportedException(m.NodeType + " is not supported!");
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}
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this.Visit(m.Object);
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this.Visit(m.Arguments[0]);
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string right = this.m_conditionParts.Pop();
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string left = this.m_conditionParts.Pop();
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this.m_conditionParts.Push(String.Format(format, left, right));
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return m;
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}
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}
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}
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace Hncore.Infrastructure.EntitiesExtension
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{
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internal class ConditionBuilder : ExpressionVisitor
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{
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private List<object> m_arguments;
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private Stack<string> m_conditionParts;
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public string Condition { get; private set; }
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public object[] Arguments { get; private set; }
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public void Build(Expression expression)
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{
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PartialEvaluator evaluator = new PartialEvaluator();
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Expression evaluatedExpression = evaluator.Eval(expression);
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this.m_arguments = new List<object>();
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this.m_conditionParts = new Stack<string>();
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this.Visit(evaluatedExpression);
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this.Arguments = this.m_arguments.ToArray();
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this.Condition = this.m_conditionParts.Count > 0 ? this.m_conditionParts.Pop() : null;
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}
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protected override Expression VisitBinary(BinaryExpression b)
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{
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if (b == null) return b;
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string opr;
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switch (b.NodeType)
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{
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case ExpressionType.Equal:
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opr = "=";
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break;
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case ExpressionType.NotEqual:
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opr = "<>";
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break;
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case ExpressionType.GreaterThan:
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opr = ">";
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break;
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case ExpressionType.GreaterThanOrEqual:
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opr = ">=";
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break;
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case ExpressionType.LessThan:
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opr = "<";
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break;
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case ExpressionType.LessThanOrEqual:
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opr = "<=";
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break;
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case ExpressionType.AndAlso:
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opr = "AND";
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break;
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case ExpressionType.OrElse:
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opr = "OR";
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break;
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case ExpressionType.Add:
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opr = "+";
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break;
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case ExpressionType.Subtract:
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opr = "-";
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break;
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case ExpressionType.Multiply:
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opr = "*";
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break;
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case ExpressionType.Divide:
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opr = "/";
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break;
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default:
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throw new NotSupportedException(b.NodeType + "is not supported.");
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}
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this.Visit(b.Left);
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this.Visit(b.Right);
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string right = this.m_conditionParts.Pop();
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string left = this.m_conditionParts.Pop();
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string condition = String.Format("({0} {1} {2})", left, opr, right);
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this.m_conditionParts.Push(condition);
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return b;
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}
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protected override Expression VisitConstant(ConstantExpression c)
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{
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if (c == null) return c;
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this.m_arguments.Add(c.Value);
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this.m_conditionParts.Push(String.Format("{{{0}}}", this.m_arguments.Count - 1));
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return c;
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}
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protected override Expression VisitMemberAccess(MemberExpression m)
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{
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if (m == null) return m;
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PropertyInfo propertyInfo = m.Member as PropertyInfo;
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if (propertyInfo == null) return m;
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this.m_conditionParts.Push(String.Format("[{0}]", propertyInfo.Name));
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return m;
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}
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protected override Expression VisitMethodCall(MethodCallExpression m)
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{
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if (m == null) return m;
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string format;
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switch (m.Method.Name)
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{
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case "StartsWith":
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format = "({0} LIKE {1}+'%')";
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break;
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case "Contains":
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format = "({0} LIKE '%'+{1}+'%')";
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break;
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case "EndsWith":
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format = "({0} LIKE '%'+{1})";
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break;
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default:
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throw new NotSupportedException(m.NodeType + " is not supported!");
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}
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this.Visit(m.Object);
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this.Visit(m.Arguments[0]);
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string right = this.m_conditionParts.Pop();
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string left = this.m_conditionParts.Pop();
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this.m_conditionParts.Push(String.Format(format, left, right));
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return m;
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}
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}
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}
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