本文整理汇总了C#中ExpressionBuilder类的典型用法代码示例。如果您正苦于以下问题：C# ExpressionBuilder类的具体用法？C# ExpressionBuilder怎么用？C# ExpressionBuilder使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
ExpressionBuilder类属于命名空间，在下文中一共展示了ExpressionBuilder类的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Convert
protected override SequenceConvertInfo Convert(
ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
{
var predicate = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var info = builder.ConvertSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]), predicate.Parameters[0]);
if (info != null)
{
info.Expression = methodCall.Transform(ex => ConvertMethod(methodCall, 0, info, predicate.Parameters[0], ex));
if (param != null)
{
if (param.Type != info.Parameter.Type)
param = Expression.Parameter(info.Parameter.Type, param.Name);
if (info.ExpressionsToReplace != null)
foreach (var path in info.ExpressionsToReplace)
{
path.Path = path.Path.Transform(e => e == info.Parameter ? param : e);
path.Expr = path.Expr.Transform(e => e == info.Parameter ? param : e);
}
}
info.Parameter = param;
return info;
}
return null;
}示例2: BuildSkip
static void BuildSkip(ExpressionBuilder builder, IBuildContext sequence, ISqlExpression prevSkipValue, ISqlExpression expr)
{
var sql = sequence.SqlQuery;
builder.SqlProvider.SqlQuery = sql;
sql.Select.Skip(expr);
builder.SqlProvider.SqlQuery = sql;
if (sql.Select.TakeValue != null)
{
if (builder.DataContextInfo.SqlProviderFlags.GetIsSkipSupportedFlag(sql) ||
!builder.DataContextInfo.SqlProviderFlags.IsTakeSupported)
sql.Select.Take(builder.Convert(
sequence,
new SqlBinaryExpression(typeof(int), sql.Select.TakeValue, "-", sql.Select.SkipValue, Precedence.Additive)));
if (prevSkipValue != null)
sql.Select.Skip(builder.Convert(
sequence,
new SqlBinaryExpression(typeof(int), prevSkipValue, "+", sql.Select.SkipValue, Precedence.Additive)));
}
if (!builder.DataContextInfo.SqlProviderFlags.GetAcceptsTakeAsParameterFlag(sql))
{
var p = sql.Select.SkipValue as SqlParameter;
if (p != null)
p.IsQueryParameter = false;
}
}示例3: BuildMethodCall
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
if (sequence.SelectQuery.Select.TakeValue != null || sequence.SelectQuery.Select.SkipValue != null)
sequence = new SubQueryContext(sequence);
var lambda = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var sparent = sequence.Parent;
var order = new ExpressionContext(buildInfo.Parent, sequence, lambda);
var body = lambda.Body.Unwrap();
var sql = builder.ConvertExpressions(order, body, ConvertFlags.Key);
builder.ReplaceParent(order, sparent);
if (!methodCall.Method.Name.StartsWith("Then"))
sequence.SelectQuery.OrderBy.Items.Clear();
foreach (var expr in sql)
{
var e = builder.ConvertSearchCondition(sequence, expr.Sql);
sequence.SelectQuery.OrderBy.Expr(e, methodCall.Method.Name.EndsWith("Descending"));
}
return sequence;
}示例4: IsSequence
public bool IsSequence(ExpressionBuilder builder, BuildInfo buildInfo)
{
var expr = (ChangeTypeExpression)buildInfo.Expression;
var info = new BuildInfo(buildInfo, expr.Expression);
return GetBuilder(builder, info).IsSequence(builder, info);
}示例5: BuildMethodCall
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var query = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[1], new SqlQuery()));
var except = query.SqlQuery;
sequence = new SubQueryContext(sequence);
var sql = sequence.SqlQuery;
except.ParentSql = sql;
if (methodCall.Method.Name == "Except")
sql.Where.Not.Exists(except);
else
sql.Where.Exists(except);
var keys1 = sequence.ConvertToSql(null, 0, ConvertFlags.Key);
var keys2 = query. ConvertToSql(null, 0, ConvertFlags.Key);
if (keys1.Length != keys2.Length)
throw new InvalidOperationException();
for (var i = 0; i < keys1.Length; i++)
{
except.Where
.Expr(keys1[i].Sql)
.Equal
.Expr(keys2[i].Sql);
}
return sequence;
}示例6: StringContainsString
public void StringContainsString()
{
var builder = new ExpressionBuilder<User>();
var condition = builder.BuildContains("Password", "123");
var where = builder.Build(condition);
var results = db.Set<User>().Where(where).ToList();
Console.WriteLine(results.Count + "条数据");
}示例7: NotEqualsTupleTrue_Test
public void NotEqualsTupleTrue_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<bool,bool, bool>> expression = builder.Create<Func<bool,bool, bool>>("A != B");
Func<bool,bool, bool> func = expression.Compile();
Assert.IsTrue(func(false, true));
}示例8: EvaluateBoolValue_Test
public void EvaluateBoolValue_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<bool>> expression = builder.Create<Func<bool>>("false");
Func<bool> func = expression.Compile();
Assert.AreEqual(func(), false);
}示例9: Cos_Test3
public void Cos_Test3()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<double,double>> expression = builder.Create<Func<double, double>>("-COS -A");
Func<double,double> func = expression.Compile();
Assert.AreEqual(func(Math.PI), 1);
}示例10: Poli3ArgsPlusConstantPlusParentesisFunction_Test
public void Poli3ArgsPlusConstantPlusParentesisFunction_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<int,int, int,int>> expression = builder.Create<Func<int,int, int, int>>("A * (B+C)+6");
Func<int,int, int, int> func = expression.Compile();
Assert.AreEqual(func(16, 2, -2), 6);
}示例11: EmptyParentesisExpression_Test
public void EmptyParentesisExpression_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<int>> expression = builder.Create<Func<int>>("2+1+()-1");
Func<int> func = expression.Compile();
Assert.AreEqual(func(), 0);
}示例12: Cos_Test
public void Cos_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<int,int>> expression = builder.Create<Func<int, int>>("COS A");
Func<int,int> func = expression.Compile();
Assert.AreEqual(func(0), 1);
}示例13: EmptyExpression_Test
public void EmptyExpression_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<bool>> expression = builder.Create<Func<bool>>("");
Func<bool> func = expression.Compile();
Assert.IsTrue(func());
}示例14: EvaluateNumericalOperation2_Test
public void EvaluateNumericalOperation2_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<int>> expression = builder.Create<Func<int>>("2^3");
Func<int> func = expression.Compile();
Assert.AreEqual(func(), 8);
}示例15: EvaluateConstantValue_Test
public void EvaluateConstantValue_Test()
{
ExpressionBuilder builder = new ExpressionBuilder();
Expression<Func<double>> expression = builder.Create<Func<double>>("-PI");
Func<double> func = expression.Compile();
Assert.AreEqual(func(), -1*Math.PI);
}